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Darwin, C. R. in correspondent 
Whitby, M. A. T. in correspondent 
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From:
Charles Robert Darwin
To:
Mary Anne Theresa Whitby
Date:
2 Sept [1847]
Source of text:
American Philosophical Society (Mss.B.D25.61)
Summary:

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.]

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Mary Anne Theresa Whitby
Date:
14 Oct [1847]
Source of text:
Lehigh University Libraries Special Collections (Honeyman Collection)
Summary:

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.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Mary Anne Theresa Whitby
Date:
12 Aug [1849]
Source of text:
New York Academy of Medicine (MS 15)
Summary:

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.

Contributor:
Darwin Correspondence Project