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» listen (mp3, 5:19) to David Kohn provide an introduction to Darwin's tree of life sketch and his private notebooks Image transcription →
I think Case must be that one generation then should be as many living as now To do this & to have many species in same genus (as is). REQUIRES extinction. ---------- Thus between A. & B. immens gap of relation. C & B. the finest gradation, B & D rather greater distinction Thus genera would be formed.— bearing relation [not shown] to ancient types.— with several extinct forms, for if each species an ancient (I) is capable of making, 13 recent forms.— Twelve of the contemporarys must have left no offspring at all, so as to keep number of species constant.— With respect to extinction we can easily see that variety of ostrich, Petise may not be well adapted, & thus perish out, or on other hand like Orpheus. being favourable many might be produced.— This requires that the permanent varieties produced
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