After some discussion, Lyell and Hooker decided on a joint presentation at the Linnean Society on 1 July of On the Tendency of Species to form Varieties; and on the Perpetuation of Varieties and Species by Natural Means of Selection.
Αυτοί συμφώνησαν να γίνει μια κοινή παρουσίαση στην Linnean Society του Λονδίνου την 1η Ιουλίου με τίτλο On the Tendency of Species to form Varieties; and on the Perpetuation of Varieties and Species by Natural Means of Selection.