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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
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 |