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New Haven, Conn., April 25, 1908.
I am not a physician or a biologist, and were it not for the fact that I have been assured by both that no one really knows anything about the subject I choose to discuss, I would be very loath to tread on strange ground in the face of assured opposition. Since no one knows, however, I am prepared to submit the following dissertation for exactly what it is worth, the observation of a fairly good observer, wholly untrained in the subject.
Some years ago my attention was attracted to the question of determination of sex by a neighbor, a farmer, who had a Jersey bull which always sired heifer calves. Out of a whole season's get, I do not know how many, not more than one or two were bull calves. This bull was an exceedingly active, robust animal, I think the most
Ellis A. The Determination of Sex. JAMA. 1908;L(18):1441–1442. doi:10.1001/jama.1908.02530440051018
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