Thanks for THH’s address [to Geological Society, Q. J. Geol. Soc. Lond. 25 (1869): 28–53]. Admires it and enjoyed attack on William Thomson hugely, but would tremble if he were in THH’s boots. Distinction made by THH between evolutionists and uniformitarians is too great. CD’s sentences on age of world in Origin will do, but he might have been less timid had he read THH.

Thanks for [D. D. Cunningham’s] letter. Had hoped for a better haul but delighted to hear of the curious fossil.

Haeckel wants British specimens of calcareous sponges. Can THH tell him to whom he can apply?

Health not improving – cannot climb even a hill.

Has heard THH’s article on Comte ["Scientific aspects of Positivism", Lay sermons (1870)] is a splendid success.

James Orton, U. S. naturalist, has sent him a tooth from skull of a horse found in Quito, Ecuador in deposits containing Mastodon, etc. JO asked CD to send it to Owen, but, since he does not communicate with Owen, he is sending it to THH.

V. O. Kovalevsky, Russian translator [of Variation], wishes to hear THH lecture.

Delighted with THH’s review [in Academy (1869)] of Haeckel’s [Natürliche] Schöpfungsgeschichte [1868],

but groans about THH’s view of rudimentary organs. Cites Origin and Variation.