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The author's "theory of sex" was first presented to the Obstetrical Society of London in 1900. It is now worked out into a monograph of about 200 pages which contains a considerable collection of reports of various cases which form the clinical basis of the hypothesis. The theory is that the sex of the fetus is not due to the male parent, but depends on the ovary which supplied the ovum that was fertilized; and that a male fetus is due to the fertilization of an ovum from the right ovary and a female fetus is the fertilization of an ovum from the left ovary.
To show that the male parent does not influence the sex of the child a number of instances are given in which a woman has had only girls or only boys by two husbands, while other cases are given in which husbands have had children
The Causation of Sex. A New Theory of Sex Based on Clinical Materials.. JAMA. 1910;LIV(5):405–406. doi:10.1001/jama.1910.02550310073021
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