Sends three tables on the known geological distribution of genera and subgenera of Brachiopoda. Has been continually puzzled by intermediate forms, and is convinced that the greater number of species can be linked together. "Natura non facit saltum."

Sends some replies to CD’s queries and data on pigeon flights between Bordeaux and Verviers.

Encloses amended note of £372 for third edition of Origin. Provides details of the calculation of profits.

[Letter printed in REG, Tabular view of the primary divisions of the animal kingdom.] Dedicates his book to CD in testimony of his admiration of CD’s successful attempt to throw light on "the mystery of mysteries of organic nature".

[Queries in CD’s hand answered on same pages by WBT.] Sexual selection of fowls; role of beauty in cocks.

Sexual behaviour of fowls.