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To Isaac Anderson-Henry   2 February [1863]

Summary

Suggests collecting seeds at different heights from British Columbia.

Describes experiment on seeds from short anthers.

C. V. Naudin writes he has discovered cause of hybrid sterility.

Author:  Charles Robert Darwin
Addressee:  Isaac Anderson; Isaac Anderson Henry
Date:  2 Feb [1863]
Classmark:  DAR 145: 2
Letter no:  DCP-LETT-3964

From Isaac Anderson-Henry   14 February 1863

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Summary

On holiday; cannot answer CD’s questions.

Author:  Isaac Anderson; Isaac Anderson Henry
Addressee:  Charles Robert Darwin
Date:  14 Feb 1863
Classmark:  DAR 159: 63
Letter no:  DCP-LETT-3985