The causation of sex in man : a new theory of sex based on clinical materials together with chapters on forecasting or predicting the sex of the unborn child and on the determination or production of either sex at will / by E. Rumley Dawson.
- Dawson, E. Rumley (Ernest Rumley), -1918.
- Date:
- 1921
Licence: In copyright
Credit: The causation of sex in man : a new theory of sex based on clinical materials together with chapters on forecasting or predicting the sex of the unborn child and on the determination or production of either sex at will / by E. Rumley Dawson. Source: Wellcome Collection.
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![Mrs. P. C. R. writes: “This date [of insemination] was just before the period ”— a girl was born; and “ the last girl was just after, so that idea is knocked on the head and proved.” Emphasised words as in original letter. This case is most convincing, as the patient, who most earnestly longed for a boy, had been strongly advised to attempt fertilisation only after a period. This she did, and obtained a girl. Being then advised by other friends to try just before the period, and a boy would surely result, she obtained the second girl she writes of above. So that this one patient disproves both ideas. It shows, as I con- tend, that a girl can be obtained by either pre- or post- menstrual fertilisation, provided the ovum is female. Mrs. V. B., who has had four boys and no girls, writes thus: “I think all my babies have been started directly after a period.” This case necessarily disproves the idea that girls are due to fertilisation just after the period only, though sup- porting the idea that this leads to the birth of a boy. Mrs. G. W., who has had three girls, writes that she has “ found that immediately after has produced my girls.” This case and the previous one remarkably contradict each other. Mrs. L. P. writes in her letters to me thus (the words in italic are emphasised in the original letters): I am anxious to have a son, and have already had two daughters. One thing I do know is that both my girls have been made the day after my period is over. It is 110 use my trying directly after / I am sure it would be a girl, for directly after the period has meant a daughter each time so far.” After consulting me, I wrote and advised that the time of fertilisa- tion was immaterial, as long as the correct ovum was fer- tilised according to my rules. She wrote me later thus: “I am going to have a baby. It was directly after my monthly trouble. I followed your advice entirely, and this is the result.” “My little son was born quite hale and hearty, a splendid specimen.” Here is a case of a patient getting her desired son by fertilisation directly after the period I advised, although she had been convinced that directly after led always to 14](https://iiif.wellcomecollection.org/image/b29821411_0227.jp2/full/800%2C/0/default.jpg)
