Now understands importance of swim-bladder in selachians. Always imagined animal like Lepidosiren was parent form of vertebrates.

Has been nearly a month in London, collecting facts on sexual selection from breeders and at Zoological Gardens.

Astonished at hybrid of rabbit and hare. Is it certain that work was done with hare?

Thanks for two small works.

Will read essay on man [Entstehung des Menschengeschlechts] with much interest.

Generelle Morphologie reviewed by G. Bentham ["Anniversary Address", Proc. Linn. Soc. Lond. (1867–8): lviii–c].

Extremely sceptical of hare–rabbit hybrid.

Thanks for [Natürliche] Schöpfungsgeschichte [1868]. "What an indomitable worker you are."

Agrees with EH’s Entstehung des Menschengeschlechts [1868].

Congratulates EH on birth of child.

Mentions projected translation of Generelle Morphologie.

Comments on EH’s last book [Natürliche Schöpfungsgeschichte]. Criticises EH’s statements on palaeontology.

Concerning death of August Schleicher.

Suggests Englishmen who might provide sponge specimens.

Mentions views of Sars on species.

EH’s work on Siphonophora.

Comments on new edition of EH’s book [Natürliche Schöpfungsgeschichte, 2d ed. (1870)].

Mentions his own book [Descent].

Visit by Kölliker.

Comments on Descent.

EH’s refusal of position at Vienna.

Refers to priest who believes in "our ape-like progenitors".

EH’s work on sponges.

Pangenesis.

Describes new edition of Origin [6th]

and his work on plant crossing.

Comments on EH’s criticism of authors in third edition of Natürliche Schöpfungsgeschichte [1872].

Discusses book by H. C. Bastian [The beginnings of life (1872)].

Comments on EH’s forthcoming [Die Kalkschwämme (1872)].

Thinks EH is working much too hard.

On EH’s Die Kalkschwämme [1872].

Comments on EH’s Natürliche Schöpfungsgeschichte [4th ed.].

Has written paper on rudimentary structures ["Complemental males of certain cirripedes", (1873) Collected papers 2: 177–82].

Edward Morse thinks brachiopods should be classed with annelids ["The systematic position of the Brachiopoda", Proc. Boston Soc. Nat. Hist. 15 (1873): 315–73].

Thanks for 5th edition of his book [Natürliche] Schöpfungsgeschichte.

CD continues with his experiments on the digestive power of plants, which is much like that of mammals.

Is also preparing a revised edition of Descent.

Would welcome hearing more of his ideas about Pangenesis.

Postscript about Anthropogenie, which has just arrived. EH’s astonishing productivity.

Comments on review of EH’s Anthropogenie [1874].

Mentions recent work of Huxley and other scientists.

Thanks for F. v. Hellwald [Culturgeschichte (1875)].