From:
Charles Robert Darwin
To:
Robert McLachlan
Date:
23 Mar [1866]
Source of text:
Raab Collection (dealer) (June 2014)
Summary:
Thanks for the paper on Sterrha (McLachlan 1865).
Contributor:
Darwin Correspondence Project
From:
Robert McLachlan
To:
Charles Robert Darwin
Date:
21 Feb 1868
Source of text:
DAR 86: A8–9, DAR 82: A88–9
Summary:
On numerical proportions of sexes in insects; coloration. Dimorphism in dragonflies (Agrion) in which usual coloration is reversed in sexes [see Descent 1: 362–4].
Wallace seems to ride his hobby too hard.
Contributor:
Darwin Correspondence Project
From:
Robert McLachlan
To:
Charles Robert Darwin
Date:
24 Feb 1868
Source of text:
DAR 82: A86–7
Summary:
Reports that when August Meyer confined several distinct species of Phryganeidae they coupled and produced fertile ova, indicating that some specific characters are not so important so far as reproduction is concerned [see Descent 1: 342 n. 2].
Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Robert McLachlan
Date:
25 Feb [1868]
Source of text:
Smithsonian Libraries and Archives (Dibner Library of the History of Science and Technology)
Summary:
Is obliged for the facts about the hybrids [see 5910], which permit him to reject the view of B. D. Walsh (and H. W. Bates?) that organs play an important part in keeping incipient species distinct.
He has asked John Murray to send RM a copy of Variation.
Contributor:
Darwin Correspondence Project