Describes his lectures on CD’s theory.

Thanks CD for copy of Variation. Comments on book.

Describes work of two protégés in Jena: Nicolas von Miklucho[-Maclay] and Anton Dohrn.

His cousin, Wilhelm Bleek, is sending an article about the origin of language.

Asks to keep book a few months longer but will return it if CD needs it [Webb and Berthelot, Histoire naturelle des Îles Canaries, vol. 3, pt 1: Géographie botanique (1840)].

Describes research on Siphonophora.

Describes life in Jena. Mentions alpine accident during wedding trip.

Discusses the origin and characters of sheep breeds, particularly the merino.

Reports observations on reversion to wild type in canary mules

and lists some animals that show a unique development restricted to one side of their bodies.

Forwards a letter from Secretary of Yorkshire Philosophical Society. Hopes CD will honour them by accepting.

Has heard nothing of Variation.

There is so much detail in Variation that WDF will never be able to finish it. Some chapters, like that on reversion, are "curious".

No summary available.

Would like a look at Nathusius.

Edward Blyth’s inability to recognise cats’ skulls.

Delighted to hear of success of EH’s lectures.

Ernest Faivre [La variabilité des espèces (1868)] sees no reason to favour common descent of allied species.

Asks EH to pass German edition of Variation on to Gegenbaur.

Comments on work of Miklucho[-Maclay], Dohrn, and Bleek.

Has begun work on Descent.

Advance sale of Variation has exhausted the 1500 copies printed. Murray sends note for £300 author’s payment. Wants to print 1250 more immediately.