The cause and control of sex in human offspring.

  • Jackson, R. Clay.
Date:
1926
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Licence: Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)

Credit: The cause and control of sex in human offspring. Source: Wellcome Collection.

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    The Cause and Control of Sex 107 complexions cancel and births favor the mother in her excess of shelter. 3 Girls were born. 187. Case 30 (Cane.) The father was a checker at a freight station. This involved a considerable amount of exposure under open sheds, along runways and under awnings. The mother weighed about 130 pounds. She had very light red hair and dark brown eyes. In the interview in which I obtained the data for this case, I ventured to assert to the wife that her husband had black hair and dark eyes, and that he weighed not more than 135 pounds. This estimate 1 based primarily on the fact that her two children who were with her were girls. She answered that I was exactly right as to her mate's complexion and that two days before he had weighed at 136 pounds. The mother was in good health and very active. She admitted being out of doors in spite of domestic obligations to a far greater extent than most mothers. This had always been a custom with her. In this case, exposure and weight factors cancel and complexion governs in the mother's favor with the issue already stated. Special Cases Resumed 188. Case 31. The father was a brick mason. This naturally involved excessive exposure. He weighed 170 pounds and was of sandy complexion with almost auburn hair. The mother was very dark. She had dark hair and brown eyes and weighed about 160 pounds. She was accustomed to be out doors much of the time, and her appearance vouched for it for she was very swarthy. The father's complexion governed in the issue of 3 Boys. 189. Case 32. The father was an electrician. This occupation affords a large measure of indoor protection, but in this case the mother was almost a chronic invalid. One girl was the issue. No other conditions were noted here. It seems that the illness of the mother governed through the enforcement of seclusion, since the father