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1860-1869::1862::12::27 in date 
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From:
Charles Robert Darwin
To:
William Bernhard Tegetmeier
Date:
27 [Dec 1862]
Source of text:
Archives of the New York Botanical Garden (Charles Finney Cox Collection)
Summary:

CD interested in hybrid sterility and encloses his preliminary MS. Outlines experiments to test for existence of sterility in breeds of poultry and pigeons.

Experiments on dimorphism have led him to change in part his opinion as given in Origin, and he is now asking pigeon and poultry fanciers for any examples of special selective sterility [i.e., a particular pair are sterile when crossed, but each individual is fertile with others] and hopes to investigate its inheritance.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Journal of Horticulture
Date:
[before 27 Dec 1862]
Source of text:
Journal of Horticulture, Cottage Gardener, and Country Gentleman n.s. 3 (1862): 797
Summary:

Inquires whether penguin ducks can run faster than other kinds.

Contributor:
Darwin Correspondence Project