The problem of sterility, and its relation to natural selection.
George Bentham’s support of Darwinism.
The problem of sterility, and its relation to natural selection.
George Bentham’s support of Darwinism.
The problem of dimorphic plants and their fertility.
On triumph of "Darwinianism".
Discussion of their differences on subject of protection.
Accepts invitation.
ARW’s wife will accompany him to Down.
On sounds produced by Euchirus longimanus beetle. Sends a pair by post.
CD’s oscillating views relating to protection and sexual selection.
Submits a 15–point argument against CD’s views on the coloration of female birds and insects.
On their differences concerning sexual selection and protection.
Sexual differences in coloration. Sexual selection versus natural selection as explanations. ARW continues to argue against sexual selection, saying that natural selection, in keeping the female dull for protection, would account for differences in sexual colouring more effectively than inheritance and partial transmission of sexually selected male colours. Colours of female birds of paradise. Protective coloration. Disagrees with CD on coincidence of hidden nests and bright colours of females.
Sexual selection, protection.
Dedication of Malay Archipelago to CD.
Comments on scientific papers.
Response to letter about dedication of Malay Archipelago and several scientific papers.
Changes in 5th ed. of Origin.
Now feels individual differences of paramount importance. Fleeming Jenkin has convinced him about "single variations".
Argues that [general variability] of species, not single variations or sports, is basis for modification and adaptation to new conditions.
CD expressed himself badly. F. Jenkin’s argument was against single variations ever being perpetuated.
Reception of ARW’s book, Malay Archipelago.
Weir’s paper on relation of protection to colour of caterpillars [Trans. R. Entomol. Soc. Lond. (1869): 21–6; (1870): 337–9] confirms ARW’s hypothesis.
Comments on Wallace’s Malay Archipelago.
Comments on Fritz Müller’s book [Facts and arguments for Darwin].
Responds to CD’s corrections of his work [Malay Archipelago].
Plumage of birds of paradise.
Hopes ARW has not "murdered too completely your own and my child" [natural selection] in his Quarterly Review article ["Sir Charles Lyell on geological climates and the Origin", 126 (1869): 359–94] on Lyell’s Principles [10th ed.].
CD is attributing more significance to useless variability in new [5th] edition of Origin.