The causation of sex : a new theory of sex based on clinical materials ; together with chapters on the sex of the unborn child, and on the determination of sex at will / by E. Rumley Dawson.

  • Dawson, E. Rumley (Ernest Rumley), -1918.
Date:
1909
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Licence: Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)

Credit: The causation of sex : a new theory of sex based on clinical materials ; together with chapters on the sex of the unborn child, and on the determination of sex at will / by E. Rumley Dawson. Source: Wellcome Collection.

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    FORECASTING THE SEX OF COMING CHILD 183 Mrs. T. S. had a boy June 1901, and a second boy June 1903, because June 1902 would have given a girl. Mrs. R. R. D. had a girl July 1895, and a second girl July 1897, because July 1896 would have given a boy. If instead of being the same month two years running the child is born the next month of the following year, the sex wiU be the same, thus : Mrs. C. R. R. had a girl May 5, 1901, and another girl June 5, 1902, because May 1902 would have been a boy, so the next month (June) gave the girl it was. Mrs. C. M. had a boy July 13, 1901, and another boy August 22, 1902, because July 1902 would had given a girl, so the next month (August) gave the boy. Her third child, born August 17, 1905, was a girl, because we have just seen August 1902 was a boy, so August 1903 would have been a girl, August 1904 would have been a boy, and thus August 1905 was the girl—i.e. three years after the last boy. Hence, if children are born in the same month an odd number of years apart they are of opposite sex ; if an even number of years intervene they are of the same sex, thus : Mrs. K. C. P. had twin boys on March 25, 1888, and four years later to the actual day, viz. March 25, 1892, she was again delivered of twin boys ; so that because the births occurred in the same month an even number of years after¬ wards, she had the same sex children again. That she would have twins could not of course be foretold (See also the examples in the case of the Empress of Russia's three last daughters, detailed in the next chapter.) We therefore get the general rule to proceed alternately from the known date and month of a child's birth down to the month the coming child is expected to be born in. We can then foretell its sex, though this method is not so invariably correct as is calculating from the ovulation periods. Thus : Mrs. K. M. had a girl May 1896, and a boy July 1897, for May 1897 would have been a boy, June 1897 would have been a girl, and so July 1897 was a boy. Mrs. S. C. D. had a girl April 1902, and a boy October 1903 ;