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To Robert McLachlan   25 February [1868]

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.

Author:  Charles Robert Darwin
Addressee:  Robert McLachlan
Date:  25 Feb [1868]
Classmark:  Smithsonian Libraries (Dibner Library of the History of Science and Technology)
Letter no:  DCP-LETT-5934B

To Robert McLachlan   12 March [1879]

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.]

Author:  Charles Robert Darwin
Addressee:  Robert McLachlan
Date:  12 Mar [1879]
Classmark:  Superior Galleries (dealers) (28–31 January 1990)
Letter no:  DCP-LETT-11927A

To Robert McLachlan   23 March [1866]

Summary

Thanks for the paper on Sterrha (McLachlan 1865).

Author:  Charles Robert Darwin
Addressee:  Robert McLachlan
Date:  23 Mar [1866]
Classmark:  Raab Collection (dealer) (June 2014)
Letter no:  DCP-LETT-5038F

From Robert McLachlan   23 April 1877

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.

Author:  Robert McLachlan
Addressee:  Charles Robert Darwin
Date:  23 Apr 1877
Classmark:  DAR 171: 1
Letter no:  DCP-LETT-10939

From Robert McLachlan   13 March 1879

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.

Author:  Robert McLachlan
Addressee:  Charles Robert Darwin
Date:  13 Mar 1879
Classmark:  DAR 171: 2
Letter no:  DCP-LETT-11930

From Robert McLachlan   21 February 1868

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.

Author:  Robert McLachlan
Addressee:  Charles Robert Darwin
Date:  21 Feb 1868
Classmark:  DAR 86: A8–9, DAR 82: A88–9
Letter no:  DCP-LETT-5910

From Robert McLachlan   24 February 1868

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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].

Author:  Robert McLachlan
Addressee:  Charles Robert Darwin
Date:  24 Feb 1868
Classmark:  DAR 82: A86–7
Letter no:  DCP-LETT-5924

From Robert McLachlan   20 February 1871

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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.

Author:  Robert McLachlan
Addressee:  Charles Robert Darwin
Date:  20 Feb 1871
Classmark:  DAR 89: 79–80
Letter no:  DCP-LETT-7498
Document type
letter (8)
Correspondent
Darwin, C. R.[X]
McLachlan, Robert[X]
Date
1866 (1)
1868 (3)
1871 (1)
1877 (1)
1879 (2)
letter