= On the Tendency of Species to Form Varieties by Charles Darwin and Alfred Russel Wallace
{c}
{title2=1858}
https://darwin-online.org.uk/converted/published/1858_species_F350.html
Primary communication: introduction dated 30 June 1858; read 1 July; this record identifies printing on 20 August. Includes Darwin extracts and Wallace's independent essay. The editorial correction concerning the date of Darwin's early sketch must not be confused with the words of the 1858 introduction.
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