Summary

On sounds produced by Euchirus longimanus beetle. Sends a pair by post.

Summary

CD’s oscillating views relating to protection and sexual selection.

Summary

Submits a 15–point argument against CD’s views on the coloration of female birds and insects.

Summary

On their differences concerning sexual selection and protection.

Summary

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.

Summary

Sexual selection, protection.

Summary

Dedication of Malay Archipelago to CD.

Comments on scientific papers.

Summary

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".

Summary

Argues that [general variability] of species, not single variations or sports, is basis for modification and adaptation to new conditions.

Summary

CD expressed himself badly. F. Jenkin’s argument was against single variations ever being perpetuated.

Summary

Reception of ARW’s book, Malay Archipelago.

Summary

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.

Summary

Comments on Wallace’s Malay Archipelago.

Summary

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.

Summary

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.

Summary

Expands upon their differences in regard to man and the question of the existence of forces not yet recognised by science.

Summary

ARW’s review of 10th ed. of Lyell’s Principles [see 6684] is admirable.

But he differs "grievously" with ARW on man. CD sees no necessity for an additional and proximate cause.

Summary

Asks whether sexual selection could produce the changing plumules or "battledore" scales on the wings of certain butterflies.