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86 DARWIN (CHARLES, 1809-1882). Naturalist and Author.

TWO AUTOGRAPH LETTERS SIGNED TO JOHN GOULD, THE ORNITHOLOGIST.

8 pp., 8vo. Kent, N.D. £10 16s

[To John Gould   6 October [1861]]

One letter refers to Gould's voyage to Guatamala, the other to the crossing ot birds in a state of nature.

"I am extremely much obliged to you for your present of the Trochilidae, of which I have read every word (except the synonym) from your pleasant Introduction to the end. It certainly is a grand case of local distribution; & likewise of diversified adaptation. I was particularly glad to see one sentence, which I shall some day use, in the close alliance of the species in the large genera. I see that you allude to the crossing of Birds in a state of nature; I, for one, repudiate the notion. One of the points which has interested me most. (which you will not approve of), is to number of 'races' or doubtful species." Etc.

87 DARWIN (CHARLES).

AUTOGRAPH LETTER SIGNED TO J. JENNER WEIR.

4 pp., 8vo. Down, 8th July, (1875). With addressed envelope. £5 5s

Asking for information regarding certain plants and promising to send Weir a copy of the new edition of his "Variation of Animals and Plants under Domestication."

88 DARWIN (CHARLES).

AUTOGRAPH LETTER SIGNED TO J. JENNER WEIR.

4 pp., 4to. London, 27th March, (1868). With addressed envelope. £4 4s

Regarding the habits of chaffinches, linnets, etc.