From:
Benjamin Dann Walsh
To:
Charles Robert Darwin
Date:
1 Mar 1865
Source of text:
Field Museum of Natural History, Chicago
Summary:
Sends his paper on "Willow-galls" [Proc. Entomol. Soc. Philadelphia 3 (1864): 543–644].
Lengthy criticism of Agassiz’s views on species as stated in his Essay on classification [1857].
Interested by CD’s trimorphism in Lythrum. Thinks some great mystery may lie in the fact that in some genera, some species are tri-, some di-, and some monomorphic, and in other genera, Apis, Vespa, Bombus, all the known species are dimorphic.
Contributor:
Darwin Correspondence Project