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To Mary Anne Theresa Whitby   2 September [1847]


Questions Mrs W on difference in flight capacity of male and female silkworm moths and asks her for results of experiments he suggested she do with silkworms to determine hereditariness of dark "eyebrows". [See Variation 1: 302.]

Author:  Charles Robert Darwin
Addressee:  Mary Anne Theresa Whitby
Date:  2 Sept [1847]
Classmark:  American Philosophical Society (Mss.B.D25.61)
Letter no:  DCP-LETT-1113

To M. A. T. Whitby   14 October [1847]


Thanks for a suite of male and female specimens of Lepidoptera. Lack of difference in size of wings surprises CD; the female’s being smaller than male’s in early growth is new to him. Will ask a friend in India for comparable facts.

Author:  Charles Robert Darwin
Addressee:  Mary Anne Theresa Whitby
Date:  14 Oct [1847]
Classmark:  Lehigh University Libraries Special Collections (Honeyman Collection)
Letter no:  DCP-LETT-1128
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letter (2)
Darwin, C. R.disabled_by_default
Whitby, M. A. T.disabled_by_default