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

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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$Mrs. M. L. L. had her family thus: | I t r r C Q T~i t O TY1 1“\ A T* X O X R .d ^ 2. 3. Vjrlll, OCptClUUCl x^), xuyv/. 4. Girl, August 25, 1892. 5. Boy, June 21, 1896. It is not necessary to detail others. Finally I give two convincing cases. Mrs. W. P. S. had her family thus: 1. Boy, December 8, 1900. Two months premature; ex- pected in February 1901. ] R 2. Girl, December 16, 1904. 1 R 3. Girl, December 17, 1908. 4. Girl, December 9, 1910. J A strikingly confirmatory case. The last three children were born exactly when expected. Note that each of the four was born in a December. Mrs. W. L.’s family came thus: 1. Girl, August 3, 1885. 2. Girl, September 10, 1886. 3. Girl, September 16, 1888. 4. Girl, January 17, 1890. 5. Boy, June 15, 1894. 6. Boy, September 20, 1897. 7. Girl, September 29, 1898. 8. Girl, September 3, 1900. Note how five of the births occurred in the month of September ! The above is a good example of a fairly large family with “ remarkable concordance with expectation,” and thoroughly corroborates the theory. Well might one of my reviewers write: “ The theory works out with curious exactitude in the cases tested” by him. Childien 1 and 2 support the statement that 13-months apart children are of the same sex; Nos. 2 and 3, 7 anh show that biiths in the same month an even number of yeais apart aie of the same sex; while Nos. 6 and 7 prove that the same month next year gives a change in sex.$