Von Dr. E. Kramer. Paper. Pp. 40. Berlin & Leipzig: Deutsches Verlageshaus Bong & Co., 1934.
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The pamphlet begins with a brief review and criticism of various antiquated ideas and erroneous popular beliefs regarding a possible control of the sex of human offspring. This introduction is followed by a rather lengthy exposition of the chromosome theory of sex determination. The assumption is then made that since there exists, in all vertebrate species studied, a more or less substantial deviation from the 50: 50 sex ratio expected according to the sex chromosome theory, the process of sex determination must involve the working of an additional modifying factor, which, when identified, may prove exceedingly valuable to man in his effort to control the sex of his progeny. On the basis of the works of Bluhm (1924) and Unterberger (1930 and 1932) the author concludes that such a modifying influence, at least in man, is exerted by the differential ph toleration of the X and Y sperms. The
Geschlechtsentstehung und willkürliche Geschlechtsbestimmung. JAMA. 1934;103(11):863-864. doi:10.1001/jama.1934.02750370067030