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.
Original question.
What are the substances contained in the tubes A, B, and C ?
TODO: The identities of the chemical substances in A, B and C remain undetermined. The scanned paper supplies the tube labels but no samples, compositions or observations. Each tube therefore requires its own missing experimental evidence; the labels alone do not identify any of the three chemical substances.
Original question.
What gas is contained in each of the bottles D and E ?
TODO: The gas in D and the gas in E remain unidentified. Neither bottle nor any observations of its contents are available. There is no basis for assigning a particular gas to either bottle.
Original question.
Examine the solution F for oxalic acid, and the solution G for antimony or arsenic.
TODO: Testing F for oxalic acid remains incomplete. The chemical solution and its observed test results are unavailable, so neither the presence nor the absence of oxalic acid can be reported.
TODO: Testing G for antimony or arsenic remains incomplete. The chemical solution and its observed test results are unavailable, so neither antimony nor arsenic can be identified or excluded. The alternatives named in the paper specify what to investigate; they do not establish what G contains.

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