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To Robert McLachlan   25 February [1868]


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 and Archives (Dibner Library of the History of Science and Technology)
Letter no:  DCP-LETT-5934B

From Robert McLachlan   21 February 1868


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



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
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letter (3)
Darwin, C. R.disabled_by_default
McLachlan, Robertdisabled_by_default