Summary

Is currently at work on the development in birds of organs of flight according to CD’s principles; asks permission to quote CD in stating the theory.

Urges CD to republish his works in a collected edition, to make them more readily available to Germans.

Summary

On the expression of disagreeable surprise.

Summary

Experiments with Lapageria.

Summary

Experiments are not going well, but the quantity of blood transfused was small.

Summary

Variety in rabbits less than he hoped for; will try a new mode of transfusion.

Summary

Interim report on the experiments with rabbits [to test Pangenesis].

Summary

JO found fossil shells in the Amazon Valley, which discredits Agassiz’s claim of a glacial origin.

Would like Huxley’s opinion of the fossil horse’s tooth from Quito.

Summary

Describes the unusual appearance of a horse whose mother had previously borne a foal by a quagga. The effect of one mating on the subsequent pregnancy of another mating is explained by JJW using Pangenesis.

Summary

Better news about the rabbits.

Summary

Will not be returning to London for a week; writes to save CD’s calling.

Summary

His observations on mimicry in butterflies

and self-sterility in plants.

Summary

HM intends studying bees to find evidence supporting CD’s theories. His work has shown him there are problems in separating species from varieties, and has also revealed many surprising instances of variation in habits.

Summary

Describes crying in an infant.

Summary

CD was good enough to send notice of his new book [Descent] for the first number of the Academy; asks for further contributions and suggestions.

Summary

Pleased to have encouraged CD to look at Kant.

Summary

Does not give much for botanical results of Round Island, but the zoology is wonderful.

Lyell’s new book [The student’s elements of geology (1870)]. Urges Lyell to make it Elementary principles.

Grove is disgusted with CD for being disquieted by William Thomson: "Take another dose of Huxley’s penultimate address to Geol. Soc." [Q. J. Geol. Soc. Lond. 25 (1869): 28–53].

Summary

Thanks CD for copy of Origin.

Encloses extensive, but incomplete, notes on expression among the insane, dealing specifically with blushing and the actions of the platysma and grief muscles.

Summary

He and Milne-Edwards are nominating CD for the Académie Française.

Sending book [Charles Darwin et ses précurseurs Français (1870)].

Despite their differences of opinion, expresses his respect and admiration.

Summary

Explains that law of inertia, and most of modern mechanics, is all wrong. Explains his concept of "elasticity" of bodies. Applies it to physiology.