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
From:
Robert McLachlan
To:
Charles Robert Darwin
Date:
20 Feb 1871
Source of text:
DAR 89: 79–80
Summary:
Thanks for Descent; will forward any information he has after he has studied it.
Instance of inequality in left and right anal appendices of caddis-fly.
Contributor:
Darwin Correspondence Project
From:
Robert McLachlan
To:
Charles Robert Darwin
Date:
23 Apr 1877
Source of text:
DAR 171: 1
Summary:
Thanks CD for helping his successful candidacy for F.R.S.
He is working up Arctic insects. Bombus is found at 83° N., as far north as has been reached.
Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Robert McLachlan
Date:
12 Mar [1879]
Source of text:
Superior Galleries (dealers) (28–31 January 1990)
Summary:
Asks RMcL to correct the proper names in enclosed proof of a letter from Fritz Müller to be published in Nature. CD has no book with names of Trichoptera. [See 11930.]
Contributor:
Darwin Correspondence Project
From:
Robert McLachlan
To:
Charles Robert Darwin
Date:
13 Mar 1879
Source of text:
DAR 171: 2
Summary:
Returns to CD a corrected proof [of "Fritz Müller on a frog having eggs on its back", Nature 19 (1878–9): 462–4].
Discusses adaptations of the pupae of, and Fritz Müller’s work on, Trichoptera.
Contributor:
Darwin Correspondence Project