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. R. L. by her first husband had 1 girl | 0 boys by „ ,, second ,, ,, 3 girls f either. Mrs. P. B. by her first husband had 2 girls )o boys by „ ,, second ,, ,,2 ,, j either. Mrs. Mk. by her first husband had 4 „ „ second „ „ 3 Mrs. S. by her first husband had 3 „ „ second „ „ 3 Mrs. L. T. H. by her first husband had 2 „ „ second „ „ 1 Mrs. L. D. by her first husband had 4 „ „ second ,, „ 1 Mrs. W. by her first husband had 2 „ „ second „ „ 1 boys y y o boys)0 .. I o boys boy ' boys]0 boy j boys) 0 boy j girls by either, girls by either, girls by either, girls by either, girls by either. Surely if the husbands settled the sex, the above mothers would have had mixed children, instead of only one-sexed children by two different men; the wives were unilaterally sterile. These cases show that the spermatozoa of two different men were quite unable to produce both sexes in certain women, so that sex determination does not lie in the spermatozoa. In the following cases the husband of more than one wife gets one-sexed children only from each wife; but as they differ in the different wives, while the sexual act is the same for each wife, the inference must be that the wife settles the sex. Mr. G. Y. by his first wife had 3 girls, 0 boys. ,, ,, second „ 3 boys, o girls. „ „ third „ 1 boy, o girls. Mr. L. by his first wife had 3 boys, o girls; then he married a widow who already had one girl by her first husband; by the widow, his second wife, L. had 3 girls, o boys. Mr. P. by his first wife had 3 boys, o girls. „ „ second „ 5 girls, o boys. Mr. S. by his first wife had 7 boys, 0 girls. „ „ second „ 1 girl, o boys. Mr. H. B. by his first wife had 3 boys, 0 girls. ,, „ second „ 4 girls, 0 boys.](https://iiif.wellcomecollection.org/image/b29821411_0075.jp2/full/800%2C/0/default.jpg)
