Past exam of the medicine course of the University of Oxford / 1866 / Second examination / Forensic medicine and hygiene (No. III.)

Original volume: Examination papers for the Degree of Bachelor of Medicine by the University of Oxford (1864–1867). Open the original paper in the scanned volume.

Original questions are transcribed from the public-domain edition. Credit: Wellcome Collection; original supplied by Royal College of Physicians, London. Source and public-domain rights statement.

What are the symptoms and treatment of (1) poisoning by Opium, and (2) poisoning by Antimony? For what other affections are these forms of poisoning most likely to be mistaken ?

Opium poisoning characteristically causes progressive unconsciousness with dangerously depressed breathing; acute poisoning by soluble antimony compounds chiefly causes violent gastrointestinal illness and collapse. Each requires its own differential diagnosis and treatment. The historical discussion below describes an 1866 examination answer; the present medical explanation is distinguished explicitly.

With opium poisoning, early drowsiness progresses to deep coma. Pupillary constriction, slow shallow breathing, snoring or gurgling breathing, a limp body and cyanosis are important findings. Failure to wake the person, together with depressed breathing, is more significant than apparent peaceful sleep. The pupils need not remain small in advanced hypoxia, and a single sign cannot establish the diagnosis.^[ref]

An 1866 practitioner would seek to remove unabsorbed opium by a stomach pump or an emetic, try to rouse the patient, and sustain breathing by artificial respiration. The contemporary encyclopedia explicitly states that no antidote was known. For antimony, the same source recommended a decoction of Peruvian bark; such tannin-containing preparations belong to the history of attempts to render the poison insoluble, not to a demonstrated modern antidote regimen.^[ref]

In present practice the immediate priorities in severe opioid poisoning are an open airway, adequate pulmonary ventilation and urgent medical support, together with naloxone to reverse the opioid effect. Continued observation is needed because respiratory depression can return after reversal. Pouring liquids into the mouth or inducing vomiting can cause aspiration; efforts to rouse the person must not delay effective breathing support.^[ref][ref]

The principal mimics of opium poisoning include alcohol intoxication, a stroke formerly described as “apoplexy”, and other causes of coma, such as hypoglycaemia or uraemia. Establish the sequence of symptoms and exposure, examine breathing and the pupils, and look for focal neurological signs. Odour of alcohol does not exclude a second poison or a stroke. Modern testing of blood glucose and appropriate neurological assessment complement the exposure history; urgent treatment of failed breathing must not await a chemical identification.

For antimony poisoning, the important period exposure is tartar emetic, or antimony potassium tartrate. Acute ingestion may cause nausea, repeated vomiting, abdominal pain, profuse diarrhoea, thirst, weakness and circulatory collapse. Loss of water and electrolytes compounds the toxicity. Present knowledge also recognizes serious cardiac effects; repeated exposure may produce continuing gastrointestinal illness and weakness rather than one dramatic attack. The chemical form matters: these findings should not be generalized to every exposure to metallic antimony.^[ref]

The closest clinical confusions are cholera, severe gastroenteritis, and poisoning by other irritants, especially arsenic. Recurrent attacks associated with particular food or medicine, persistence outside an outbreak, and chemical examination of vomit, excreta and suspected preparations help distinguish them. These are clues for investigation, not grounds for declaring a particular person guilty.

Modern management of antimony poisoning stops further exposure, supports breathing and blood circulation, replaces fluid and electrolyte losses, and monitors cardiac arrhythmias and organ function. A specialist determines whether decontamination or chelation is appropriate. The institutional monograph records sparse human evidence for chelation; it does not justify presenting a tannin drink or any chelator as a certain cure. It is a later, explicitly dated toxicological comparison, not the treatment available to the 1866 candidate.^[ref]

What mode of procedure would you adopt in trying to detect the presence of Arsenic or Digitalin in the contents of the Stomach ?

Retain the original material, examine separate portions for arsenic and digitalin, and require corroboration beyond a single colour or deposit. One is an inorganic element; the other is a historical pharmaceutical preparation of organic cardiac poisons. A procedure suited to one can destroy or lose the other.

Record the receipt, container, quantity and condition of the stomach contents. Preserve a sealed portion unchanged. Mix the remainder sufficiently to obtain representative aliquots, retaining solid particles as well as liquid. Record the portions consumed by each test and retain the resulting preparations. Test the reagents separately and include an unpoisoned comparison material where available. An analyst must distinguish poison originally present from contamination introduced by apparatus, acids or metals.

For arsenic detection, a useful period screen is deposition on clean copper warmed in an acidified portion of the material. A dark coating is only presumptive: other substances, including antimony, can interfere. Wash and dry the coated copper, then heat it in a small glass tube, examining the cooler portion for a sublimate of arsenic trioxide and its characteristic crystals under a microscope. A separately prepared clear extract allows corroborating reactions, such as the yellow arsenic trisulfide precipitate and the appropriate silver reaction. An 1844 primary account already stressed both reagent purity and the danger of confusing arsenic with other metals.^[ref]

A second classical approach converts the suspected arsenic into volatile arsine in a hydrogen-generating apparatus and decomposes it in a heated glass tube, producing a metallic mirror. This separates a volatile product from much of the original organic material. A mirror alone is insufficient, since antimony can give a similar deposit; establish the deposit's identity by further chemistry. The initial blank must include the very zinc and acid used in the examination. The apparatus produces extremely poisonous gas: this is an explanation of historical laboratory evidence, not a procedure for an uncontained demonstration. The original method of James Marsh explains the value of separating the poison in gaseous form; later confirmation must still distinguish arsenic from interfering material.^[ref]

For digitalin, work on a fresh aliquot without mineralizing it. Use an alcoholic extraction, filter away coarse material, concentrate gently, and retain rather than discard fractions until their behaviour has been checked against a reference preparation. “Digitalin” did not denote one uniform pure compound: a contemporary 1864 report distinguished preparations with markedly different solubilities. Accordingly, a negative result after one solvent partition is inconclusive; it would be particularly misleading to assume that the substance must follow the acid–base extraction behaviour of a simple alkaloid.^[ref]

Colour reactions could support the examination of a cleaned extract. Contemporary work described a brown or reddish colour with sulfuric acid, changed to violet by bromine vapour; the hydrochloric-acid green colour was already acknowledged to lack specificity. Compare a reference and a blank under the same conditions. Colour in a dirty stomach extract is not an identification, and tasting an unknown extract is not an acceptable analytical test.^[ref]

A particularly relevant development available before this examination was the physiological test investigated by Charles Hilton Fagge and Thomas Stevenson in 1865. An extracted fraction was compared with known digitalin using the response of a frog's heart. The informative effect was irregular beating followed by arrest with the cardiac ventricle pale and firmly contracted, rather than mere illness or death. Crucially, their experiments also showed that ordinary human stomach contents could injure frogs, and other cardiac poisons could resemble digitalin. A solvent blank, a comparable unpoisoned extract and a reference poison therefore matter. These are historical experiments, not a proposal to repeat animal testing for this solution.^[ref][ref]

The defensible conclusion combines extraction behaviour, chemical reactions, physiological specificity and the clinical circumstances, acknowledging uncertainty if these disagree. A modern laboratory would instead seek specific validated instrumental identification, for example chromatography coupled to mass spectrometry for an identified cardiac glycoside, with reference material and controls. That later capability must not be credited to an 1866 examiner.^[ref]

In examining the person of an adult woman who had deposed to a Rape having been forcibly committed on her twelve hours before, what signs would you seek (1) of coition having occurred, so as to legally establish the felony, (2) of consent having been withheld ?

Seek evidence of penetration and evidence bearing on violence separately; neither a finding nor its absence can by itself determine consent or establish the whole felony. Twelve hours is a reason to examine and preserve evidence promptly, not a guarantee that diagnostic traces will be present.

For the historical legal element, use the original Offences against the Person Act 1861. Section 63 made carnal knowledge complete upon proof of penetration without requiring proof of emission of seed. Thus absence of semen cannot defeat proof of the penetration element, while the presence of semen does not by itself establish that element or identify an offence. Section 48 treated rape as a felony; §63 specifies the narrower evidential point asked about here.^[ref]

Obtain permission for the examination and each specimen, record the account in the woman's own terms, and note the reported timing, pain, bleeding, washing and changes of clothes. Ask about other recent sexual contact only insofar as it affects interpretation of a trace. Record observations independently of the allegation, preserving clothing and samples with their identities and collection sites. A medical examination should also address injuries and health needs; its purpose is not merely production of evidence.

For evidence of recent penetration, inspect the vulva, vaginal entrance and, where appropriate, the vagina for fresh abrasions, bruising, tears, swelling, tenderness or bleeding. Describe the location and appearance rather than calling an injury a “rape mark”. Collect any relevant fluid and stained clothing. An 1866 examination could use microscopy to look for sperm; modern analysis may add validated semen tests and DNA profiling. Neither retained sperm nor an injury can precisely date the event to twelve hours previously or prove who performed it without additional evidence. Conversely, washing, lack of ejaculation or loss of a sample may leave no detectable trace.^[ref]

Do not infer prior sexual history from vaginal laxity or the appearance of the hymen. A fresh injury can be documented, but an uninjured or previously altered hymen cannot prove or disprove the particular alleged penetration. Current authoritative guidance expressly rejects “virginity testing” as a scientifically valid inference about intercourse.^[ref]

For evidence bearing on force and non-consent, examine the whole body for abrasions, bruises, torn clothing, restraint marks and injuries of the thighs, wrists, arms, face or neck. Record any account of threats, overpowering, loss of consciousness or inability to resist. Injuries may corroborate an account of violence, but can have other causes; their absence does not establish agreement. A frightened or incapacitated person may not struggle, and penetration can occur without visible injury. Even apparently precise examination findings must be interpreted alongside the history and other evidence.^[ref]

Some nineteenth-century medico-legal writing demanded continuing resistance as evidence of non-consent. That was a historical assumption, not a biological test of whether consent was withheld.^[ref] The medical witness should state what was observed and how strongly it supports the account; the tribunal determines the legal conclusion. No universal combination of semen, hymenal findings and bruises can “legally establish” all the elements from the examination alone.

How would you endeavour to decide whether, in a given case, Suicide is an indication of Insanity?

Suicide is evidence of an act requiring investigation, not by itself a diagnosis of mental disorder. The inquiry concerns the person's mental state before and at the act; it must not reason in a circle that self-destruction proves “insanity” because only an “insane” person would do it.

First establish that the death was intentional self-inflicted death rather than accident, another person's act or an undetermined event. Then reconstruct the preceding course from medical records, family and other witnesses, correspondence and changes in ordinary behaviour. Give greatest weight to independently observed facts recorded before the death, rather than reinterpret every eccentricity afterwards. A surviving person's current examination may help, but confusion from injury, drugs or the acute crisis must not automatically be projected backwards.

Seek sustained changes in mood, sleep, appetite, activity, reasoning and functioning. Persistent hopelessness, loss of pleasure, excessive guilt and withdrawal may indicate a depressive disorder; the strength of the inference lies in a coherent syndrome and its time course, not a single unhappy remark. Modern clinical descriptions include these features and suicidal thoughts, while emphasizing that individuals need not show every symptom.^[ref]

Investigate delusions, hallucinations, confused thought and loss of contact with reality, asking whether they influenced the act. Also consider a period of extreme excitement, delirium, dementia, intoxication, withdrawal or another bodily illness. The relevant question is how observed symptoms affected this person's understanding and decisions. For example, an independently documented false belief of unavoidable persecution provides a different kind of evidence from an ordinary financial worry. Modern psychosis may occur in several illnesses or with drugs and sleep deprivation; it is not established simply by an unusual belief or behaviour.^[ref]

The language of the 1866 paper should also be read historically. The eighth-edition encyclopedia classified “suicidal mania” among forms of “monomania” and discussed disturbed impulses even without a delusion. Those categories explain why an examiner might ask about suicide and “insanity”, but they are not interchangeable with modern diagnostic categories.^[ref]

Neither elaborate planning nor concealment proves a sound mind: organized actions can occur during serious illness. Conversely, apparently impulsive conduct does not identify one particular illness. Financial trouble, pain, bereavement, humiliation and fear may help explain a crisis, but their presence neither proves nor excludes mental disorder. The modern public-health account recognizes both associations with depression and alcohol problems and suicides during acute crises.^[ref]

A reasoned opinion therefore specifies the symptoms actually supported, their relation in time to the act, alternative explanations and remaining uncertainty. Clinical diagnosis, the capacity relevant to a particular decision, and a historical legal verdict are separate conclusions. There is no medical rule that every suicide demonstrates legal irresponsibility. This procedural question supplies no individual case history, so the complete answer is the method of assessment, not an invented verdict about a deceased person.

What points would you chiefly observe in trying to identify with a description of a missing person a Skeleton, of which the soft parts had been destroyed ?

Prioritize features that can be compared with the missing person's description and records, distinguishing a general biological profile from a distinctive match. The problem asks what to observe; it supplies no actual bones from which to invent an identification.

Begin by documenting recovery and association. Lay out and inventory the remains, confirm that they are human, and consider whether all the bones could belong to one individual. Note missing or duplicated elements and any damage from animals, burial or recovery. An apparent absence is informative only if the relevant part was actually recovered and examined. Keep the teeth and small fragments; they may contain the most useful identifying information.

Estimate age using several indicators. In the young, tooth development and eruption, growth and fusion of the epiphyses are useful. In adults, changes at the pubic symphysis, rib ends and teeth may help, but provide ranges rather than an exact birthday. Tooth wear depends on diet and habits, and cranial suture closure is variable. The human skeleton's developmental and pathological changes must be interpreted together rather than converted into an unjustifiably precise age.^[ref]

For estimated sex, give particular attention to the adult pelvis: the greater sciatic notch, subpubic region and overall form are more informative than size alone. Features of the skull can assist, but robusticity is variable and overlapping. Immature remains often do not support the same degree of certainty. For stature, measure preserved long bones, especially the femur and tibia, or reconstruct skeletal length if sufficiently complete. State the method and uncertainty: bone length is not living height, and neither sex nor stature should be inferred solely from a large or small skull.^[ref]

The most discriminating observations may be particular departures from the usual anatomy: an old healed fracture with shortening or angulation, an amputation, congenital deformity, fused anatomical joints, unusual disease changes, or a distinctive pattern of missing and repaired teeth. Record tooth positions, fillings, extractions and any appliance, distinguishing loss during life from loss after death. Compare these features with actual medical or dental records and reliable descriptions. A family's report of a healed broken leg can guide the comparison, but it does not predict which leg or what deformity must be present.

Record agreement and contradiction. Approximate age, sex and height can narrow a search but fit many people; a well-documented distinctive lesion or dental pattern can provide much stronger evidence. A mismatch must be evaluated for record error, estimate uncertainty or exclusion, not silently ignored. Do not claim that nineteenth-century racial categories or a facial reconstruction uniquely determine identity. Soft-tissue features such as eye colour, hair and skin markings cannot simply be read off a bare human skeleton.

The modern extension is a specialist comparison of ante-mortem records with post-mortem observations, potentially supplemented by DNA profiling from suitable material. This is later corroboration, not a technique available in 1866. The institutional identification guidance emphasizes reconciliation of the two records and the importance of dental or genetic evidence for conclusive identification.^[ref]

What Disinfectants are now held to be of the most value? Classify and describe their modes of action. How would you treat the clothes of a person affected with Cholera ?

For an 1866 answer, the important agents include heat, chlorine preparations, carbolic acid and related tar antiseptics, sulphurous fumigation, and certain metallic salts. Their effects on infection, decomposition and odour must be distinguished. No single chemical is best for air, excreta, clothes and every surface under all conditions.

A useful classification follows the action and use of each group. Heat disinfection, by boiling or a properly conducted hot-air process, acts on the contaminated object itself; it is especially valuable for washable fabrics. Washing and removal of dirt reduce contamination but should not be confused with a validated disinfecting exposure. In present terms, efficacy depends on the organism, temperature, exposure time and whether the heat reaches the whole object.

Chlorine water and chlorinated lime, historically called chloride of lime, provide chemically reactive chlorine species. Their oxidation and related reactions damage biological constituents; they can also destroy some odorous substances. Activity is diminished when the reagent is consumed by abundant organic dirt. Phenol, historically carbolic acid, and related tar products were valued as antiseptics. Present descriptions of phenolic action include damage to cell membranes and proteins. Neither a phenolic odour nor a chlorinated smell demonstrates a sufficient disinfecting exposure.^[ref]

Burning sulfur produces sulfur dioxide, the period “sulphurous acid gas”, used for fumigation. This is chemically distinct from chlorine oxidation, and its action depends on conditions including moisture and access to the contaminated material. Zinc chloride and iron(II) sulfate were also used to control decomposition and offensive discharges. Their historical role as acidifying or preservative agents does not establish that every treated material was rendered noninfectious. Dilution and building ventilation remove or disperse contamination but are not a substitute for treating soiled articles.

These choices are documented rather than inferred from later surgical practice. The 1866 Cattle Plague Commission reported favourably on tar acids and sulphurous acid, while cautioning against premature confidence. That animal-disease investigation shows what was valued at the time; it does not establish efficacy against every human infection.^[ref]

For the clothes of a person with cholera, regard fecal and vomit contamination as the principal hazard. Remove the articles without shaking or spreading contamination, contain them for transfer, and protect the handler's hands and clothing. Wash hands afterwards. Collect and dispose of visible excreta safely; do not contaminate a drinking supply or a communal washing place. For washable linen use thorough cleaning and a suitable heat process; bulky or delicate articles require a process that can penetrate the entire material, not just warm its exterior.

An October 1866 instruction specifically recognized transmission through soiled linen, attendants' hands and drinking water. It recommended zinc chloride for articles that iron would discolour, followed in its general scheme by carbolic treatment, and described special cleansing, fumigation and exposure to hot air under sanitary supervision. Its theory that preventing alkaline decomposition guaranteed safety was a historical hypothesis, not a valid modern criterion. An acid reaction to litmus or disappearance of smell cannot prove that Vibrio cholerae has been killed.^[ref]

Modern advice gives a clearer practical comparison: clean clothing and bedding with detergent, use an appropriate hot wash and complete drying, or an effective boiling or chemical process when indicated. The current World Health Organization guidance includes five minutes in boiling water as one option; the fabric and the whole load must actually receive that exposure. This is a present recommendation, not an invented historical recipe. Organic soiling can shield organisms or consume disinfectant, so adequate cleaning, correct concentration and contact time matter more than a nominal amount of scented fluid.^[ref][ref]

How do you detect and estimate the impurities which are most commonly found in the Air of a Sick Ward ?

Take representative samples of a measured volume, identify the impurity by an appropriate reaction, and express the blank-corrected amount per volume of ward air. Excess carbon dioxide, moisture, organic contamination, Ammonia and suspended material are the principal groups to investigate; combustion or defective drains may introduce additional gases. Smell alone measures none of them reliably.

Record occupancy, the position and height of sampling, open doors or windows, heating and lighting, temperature and sampling time. Compare indoor and outdoor samples collected under comparable conditions. Avoid breathing into the collecting vessel. A sample near an open window may miss conditions at the beds, and a sample during cleaning may contain unusually disturbed dust. Explain the sampling conditions with the result.

For carbon dioxide, “carbonic acid” in period terminology, collect a known volume in a calibrated vessel and introduce a measured portion of standardized barium hydroxide solution. Shake to promote absorption. Carbon dioxide consumes the alkaline reagent and forms barium carbonate:Determine the residual alkali in the clear liquid, excluding the carbonate precipitate from an acid determination that would redissolve it. Compare with an equal unexposed reagent portion. An 1864 report describes 7–10 litre globes and checks against gravimetric absorption, so this is an available period method rather than an instrument projected backwards.^[ref]

If $c$ is the hydrogen ion equivalent concentration of the titrating acid, and $v_b$ and $v_s$ are the respective blank and exposed-solution titration volumes, then, for the entire absorption charge,The factor two arises because one carbon dioxide molecule consumes two alkali equivalents. If only an aliquot is titrated, multiply by the ratio of total solution volume to aliquot volume. Here $P$, $T$ and $V_{\mathrm{air}}$ describe the same measured gas sample, with consistent wet- or dry-gas conventions; $R$ is the molar gas constant. Report $10^6{x}_{\mathrm{C}{\mathrm{O}}_2}$ as parts per million by volume. Other absorbed acidic gases are potential interferences. The calculation is a stoichiometric and ideal gas law interpretation, not a direct measure of infectiousness.

For water vapour, compare dry- and wet-bulb thermometers to estimate relative humidity, or pass a known volume through a suitable preweighed drying absorber and determine its mass gain. The latter gives collected water mass divided by sampled air volume, with a blank and appropriate control of other absorbable vapours. Humidity is relevant to ward conditions, but is not by itself evidence that the air contains a particular disease agent.

For Ammonia, moist red litmus becoming blue is a screening reaction, not a selective quantitative analysis. Absorb a measured volume of air into a known amount of dilute acid; the reduction in residual acidity measures absorbed volatile bases. Other alkaline vapours interfere, so do not call the result pure Ammonia without further discrimination. A modern comparison is the validated acid-treated sorbent collection and ion chromatography of the institutional air-sampling method; it too requires calibrated flow, blanks and checks for sample loss.^[ref]

For suspended dust, collect material on a preweighed filter, condition and reweigh it, and divide the blank-corrected mass increase by sampled volume. Microscopy can describe fibres, cells and other particles, but cannot turn an unspecified speck into an identified pathogen. A modern gravimetric sampling method illustrates the importance of controlled filter handling and air-volume measurement.^[ref]

Period investigators also assessed oxidizable organic contamination through the consumption of an oxidizing reagent such as potassium permanganate. Such a result is an operational measure of chemical consumption, dependent on the procedure; it does not reveal a unique substance or count living organisms. An 1865 review already warned that inorganic reducing substances also decolourized the reagent, making supposed quantitative organic estimates unreliable.^[ref] Similarly, a lead-salt darkening reaction may support the presence of hydrogen sulfide where drains are implicated, but this gas need not be present in every ward. Investigate carbon monoxide if combustion is suspected: it is odourless and cannot be excluded because the room smells fresh.^[ref]

A useful report therefore separates measured carbon dioxide, humidity, chemical contamination and particles, states detection limits and interferences, and avoids declaring ward air safe from a single result. Infectious aerosols require a separate assessment; settling plates or a few microscopic fields do not quantitatively characterize everything that patients inhale. Current infection-control guidance likewise warns about the limitations of nonspecific environmental sampling.^[ref]

What are the principal adulterations of Bread ?

In a period account of bread adulteration, give first place to alum, then distinguish undeclared flour or starch substitutions, water-retaining additions, and alleged mineral or metallic adulterants. Their actual occurrence must be demonstrated; a long list in a textbook is not proof that every loaf contains them.

Alum was added to alter the appearance and baking behaviour of inferior flour and to help produce an apparently acceptable white loaf. It is the especially well-supported English example. Arthur Hill Hassall's 1855 investigations reported alum in two series of bread samples, while finding neither potato nor other foreign flour in those series. The same work found none of the suspected mineral fillers in its examined series of forty-four flour samples. These are observations about the samples examined, not a warrant to declare all English bread adulterated.^[ref]

The organic substitutions to consider include potato or potato starch, and cheaper flours from rice, maize, rye or beans. Their economic significance is the substitution of a different material for flour sold as wheat, rather than the proposition that every such food is intrinsically poisonous. A declared mixed-grain loaf is a different case from concealed substitution. Defective or damaged flour can also be disguised through additions that improve apparent texture or colour. Moisture matters because a loaf retaining excessive water can deliver less food material for the same purchased mass.

Historical reports also discussed chalk, gypsum or plaster of Paris, clay, magnesia and other mineral fillers, together with copper(II) sulfate, or “blue vitriol”, as a baking addition. These should be presented as reported or suspected adulterants of bread or its flour, with prevalence qualified. An 1851 contemporary review gives the broad period list; the later direct analyses show why allegations require testing.^[ref]

The comparison can be made experimentally. Examine flour particles with a microscope for foreign starch granules and plant tissues, comparing reference materials; baking disrupts many structures, so unbaked flour is often more informative than a cooked crumb. Determine moisture by drying a weighed portion, and examine the ash for unusual inorganic residue. Neither excess ash alone nor a metal detected in trace quantity identifies the material added or its intention. Sampling, blanks and the natural composition of flour must be considered.

In particular, testing for alum requires distinguishing introduced material from naturally present mineral constituents and from contamination of the reagents. A pre-examination 1865 review explicitly criticized analytical errors in separating aluminium compounds from bread ash and disputed the claim that alum was invariably present. Thus the answer should name the principal adulterants while keeping the strength of the evidence visible. It should not repeat historical claims of harm as modern toxicological conclusions without an appropriate exposure assessment.^[ref]