Discussion of origin of domestic sheep races. Some comments on the yak and the wild ancestors of the llama and alpaca.
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Discussion of origin of domestic sheep races. Some comments on the yak and the wild ancestors of the llama and alpaca.
Encloses memorandum on Origin [1866]
discussing mimicry in mammals and birds,
abnormal habits shown by birds,
behaviour of cuckoos,
and analogies existing between mammals of the same geographical region.
Speculates on possible lines of development linking groups of mammals.
[CD’s notes on the verso of the letter are for his reply.]
Discusses sexual and seasonal differences in the plumage of birds and coats of mammals.
Remarks upon variations in the form of the canine tooth between the sexes in mammalian groups.
Plumage of allied species of plover.
Asks CD’s help with work on unimproved domestic animals.
Sexual differences in bird species and seasonal variation in plumage.