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From Armand de Quatrefages   4 March 1868

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Summary

Proportions of sexes of the silkworm are about equal, but knows of no statistics.

Cannot share his view of origin of species.

Author:  Jean Louis Armand (Armand de Quatrefages) Quatrefages de Bréau
Addressee:  Charles Robert Darwin
Date:  4 Mar 1868
Classmark:  DAR 85: B66–7
Letter no:  DCP-LETT-5980
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