Summary

Not surprised at delay of his book [Generelle Morphologie (1866)].

P. M. Duncan taking side of evolution.

Has received paper on Geryonidae ["Über eine neue Form des Generationswechsels bei den Medusen", Monatsber. K. Akad. Wiss. Berlin (1865): 85–94]. Had often speculated on whether such a case ever occurred in nature.

Summary

Has heard from Huxley that CD has been ill.

Progress on his book [Generelle Morphologie (1866)] has been slow.

Has been named "ordentlicher Professor". Has 150 listeners in his lectures on CD’s theory.

Thanks CD for copy [of "Climbing plants"].

Sends his book [Beiträge zur Naturgeschichte der Hydromedusen, 1. Heft: Die Familie der Rüsselquallen (Geryonidae) (1865)] and two articles.

Calls attention to a new rhizopod from Nice.

Summary

Comments on CD’s health.

Discusses origin of life and differentiation of principal classes of plants and animals.

Discusses Generelle Morphologie and its chapter on embryological development.

His lectures on CD’s theory.

Asks CD for larger portrait of himself and for several copies of the small photograph. Will send photographs of German scientists in exchange.

Summary

Asks to borrow Ernst Haeckel’s Beiträge zur Naturgeschichte der Hydromedusen (1865) [and Zur Entwicklungsgeschichte der Siphonophoren (1869)].

Has not been neglecting Pangenesis for Medusae.

Summary

No book has made such a powerful impression on EH as the Origin. Most older German scholars opposed to it, but number of supporters growing among the young. Fortunately strength of religious dogmas now small among educated Germans. Situation in Jena especially favourable. Defended CD’s theory last year at Congress of German Scientists in Stettin.

Intends special study of jellyfish.

Plans general work on natural history.

Hard fate [death of Anna Sethe Haeckel] has made EH indifferent to criticism.

Colleagues August Schleicher and Carl Gegenbaur also convinced by CD’s theory.

Summary

Discusses a variety of subjects: Cynips, galls, potato bugs,

male Daphnia laying eggs.

His Primula experiment results differ from John Scott’s.

Summary

Has forwarded FM’s MS to Max Schultze, but did not read it.

Movement of stem apex in Linum.

Haeckel’s paper on reproduction in certain Medusae.

Summary

Is engaged to marry Agnes Huschke. Will make wedding trip to Switzerland and Italy in autumn; therefore cannot visit CD as hoped.

Discusses present research. Comments on Protoamoeba with respect to origin of life. Says it makes question of common or separate origin of phyla unimportant.

CD to receive honorary diploma from Imperial Zoological Botanical Society in Vienna.

Sends photograph of Viennese botanist, August Kanitz.

Summary

Fertilisation in orchids: Friedrich Hildebrand’s paper.

Self-sterility.

Climbing plants.

Agassiz’s attempts to eliminate all Darwinian views.

Summary

Ernst Haeckel writes that young German scientists are enthusiastic for natural selection.

Did JDH write the article in Natural History Review on trees not producing flowers ["Botanical lesson books", (1864): 355–69]?

Encourages Harvey to publish on his "disagreeable" monster plants.

Summary

Sends copies of photographs of himself. Asks for photographs of German naturalists.

Comments on EH’s account of Protogenes primordialis.

Summary

On FitzRoy’s suicide.

The Lyell–Ramsay disagreement [on formation of lakes?].

Summary

Sends books.

Discusses GJR’s Pangenesis experiments; views of Galton on the theory.

Summary

Glad to read what CD sends. Any glimmer of light on those subjects is of utmost importance.

Quotes a letter from Haeckel on progress of Darwinism in Germany.

Summary

Thanks CD for notes concerning the development of his ideas about the origin of species. Says August Schleicher and Carl Gegenbaur also interested.

Names new supporters of CD’s theory, including Max Schultze, Rudolf Leuckart, and Alexander Braun. Zoologists have been more interested than botanists.

He is writing a general work on the relationships among animals [Generelle Morphologie der Organismen (1866)].

Comments on Fritz Müller’s Für Darwin [1864].

Gegenbaur is revising his Grundzüge der vergleichenden Anatomie [2d ed. (1870)] to accord with evolution.

Thanks CD for copy of book on balanids [Living Cirripedia, vol. 2].

Summary

Comments on Pangenesis. Quotes long passage from article by Fritz Müller concerning regeneration of lost members among crustaceans.

Kosmos has been sold to Eduard Koch in Stuttgart; will be converted into a weekly. Science will be de-emphasised. Krause seeking new publisher to continue on old basis.

Gustav Jäger injured in train accident.

Summary

Is sending some plants and seeds to JDH.

Thanks Mrs Hooker for telling him of a life of his grandfather [Erasmus Darwin] of which he had not heard.

Summary

Sends a pamphlet and photograph to CD [missing];

announces a botanical congress at Erfurt at which CD’s theory will be discussed.