Summary

Describes his brother Alexander’s discovery of male of Bonellia, a striking example of dimorphism. Encloses a plate with notes on his brother’s work.

The difficulty his wife, Sofya Kovalevsky, has had as a woman in being admitted to Berlin University. Kirchow [Gustav Robert Kirchhoff], at Heidelberg, has taken an interest in her.

Summary

On the expression of disagreeable surprise.

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

Experiments with Lapageria.

Summary

Would like to call at 10 o’clock on Wednesday morning.

Summary

Would like to see JDH become Sir J. H. Does not think JDH owes his position in science to his father.

Sends questions on Round Island – if JDH should write [to Henry Barkly?].

Has he read Federico Delpino on Marantaceae [Nuovo G. Bot. Ital. 1 (1869): 293–206]?

Summary

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

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

Interested that HM is studying structure of insects in relation to flowers.

Summary

The "man-essay" [Descent] is "very interesting but very difficult".

Cat-like behaviour in dogs.

Thanks for information from Louis Agassiz;

wishes he could feel he deserves what Alexander Agassiz says of him.

Summary

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

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

CD much interested by ERL’s book [On comparative longevity (1870)]. Is pleased to find ERL refers to CD’s "despised child" Pangenesis, and is also pleased how thoroughly ERL appreciates Herbert Spencer, a philosopher perhaps equal to any that has lived.

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

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

CD thinks JJW’s account [in 7137] is significant for a theory of generation and should go to some scientific society; suggests additional data is needed. Quotes cases of subsequent progeny apparently affected by a previous impregnation. Perhaps not prudent to allude to "despised" Pangenesis, which CD fully believes will have its day.

Summary

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

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.

Summary

The illness and death of his daughter have delayed his answers to CD’s queries. He has, however, worked on the circulation of the eye and has almost finished a paper on it, which he will send to CD. In general, the views of Charles Bell are confirmed.

As for CD’s second query, he doubts that the relationship exists, but will answer fully in next letter.

Summary

JC-B’s essays are the fullest CD has received. His observations on blushing closely agree with James Paget’s. Platysma and horror: Duchenne’s statement doubtful.