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To Louis Agassiz   21 February [1858]

Summary

Thanks LA for presentation copy of Contributions [to the natural history of the United States of America, vol. 1, pt 1: Essay on classification, and vol. 1, pt 2: North American Testudinata (1857)]. Flattered; CD sees there is much of highest interest to him.

Author:  Charles Robert Darwin
Addressee:  Jean Louis Rodolphe (Louis) Agassiz
Date:  21 Feb [1858]
Classmark:  Houghton Library, Harvard University (MS Am 1419: 279)
Letter no:  DCP-LETT-2217

To Asa Gray   21 February [1858]

Summary

Asks whether botanists tend to record varieties more carefully in large genera or small genera.

Wants information on the ranges of varieties of a species compared to the range of the species.

Author:  Charles Robert Darwin
Addressee:  Asa Gray
Date:  21 Feb [1858]
Classmark:  Archives of the Gray Herbarium, Harvard University (21)
Letter no:  DCP-LETT-2218