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From John Hellins   20 April 1868

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Summary

Gives the evidence on which he relied for his view, which CD thinks is erroneous, of proportion of sexes in Lepidoptera.

Author:  John Hellins
Addressee:  Charles Robert Darwin
Date:  20 Apr 1868
Classmark:  DAR 85: B71–75, B79–82
Letter no:  DCP-LETT-6133

From John Hellins   16 December 1868

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Summary

Results of his breeding have not borne out his opinion that females are more numerous in Lepidoptera [see Descent 1: 313]. Still convinced he is right, suggests only way to settle question is by controlled breeding of large numbers of each species.

Author:  John Hellins
Addressee:  Charles Robert Darwin
Date:  16 Dec 1868
Classmark:  DAR 85: B76–7, B84
Letter no:  DCP-LETT-6506

From John Hellins   10 May 1869

Summary

Notes sex ratios in Lepidoptera he is breeding.

Author:  John Hellins
Addressee:  Charles Robert Darwin
Date:  10 May 1869
Classmark:  DAR 166: 138
Letter no:  DCP-LETT-6745
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letter (3)
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1868 (2)
1869 (1)
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