From:
Nikolai Alekseevich Severtsov
To:
Charles Robert Darwin
Date:
25 Sept [1875]
Source of text:
DAR 177: 143
Summary:
Sends CD the 2d part of his travels into the Tien-shan mountains [Erforschung des Thian-Schan Gebirgs-Systems (1875)].
Has written a paper on the ranges and systematics of wild sheep and on modifications probably resulting from competition with domestic sheep, which he wishes to translate into English and would like to see appended to Variation.
Discusses sexual selection in thrushes; it apparently modifies one species into another.
Contributor:
Darwin Correspondence Project