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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

To M. A. T. Whitby   12 August [1849]


Thanks MATW for the results of her experiments on the inheritance of caterpillar peculiarities and would be grateful for any further observations on differences in structure or habits between silkworm breeds, or peculiarities in inheritance.

Author:  Charles Robert Darwin
Addressee:  Mary Anne Theresa Whitby
Date:  12 Aug [1849]
Classmark:  New York Academy of Medicine (MS 15)
Letter no:  DCP-LETT-1194
Document type
letter (3)
Darwin, C. R.[X]
Whitby, M. A. T.[X]
1847 (2)
1849 (1)