The cause and control of sex in human offspring.

  • Jackson, R. Clay.
Date:
1926
Catalogue details

Licence: Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)

Credit: The cause and control of sex in human offspring. Source: Wellcome Collection.

    105/222 (page 101)
    The Cause and Control of Sex 101 degree of protection than did the father at his work. After the health of the mother failed, two girls in suc¬ cession were born. 169. Case 13. The father was a chauffeur. One boy was born to the couple. The father's occupation gave him a heavy margin of exposure out of doors, but he was of a sandy complexion, (near auburn), a man of excessive vitality and of a very rugged build. It seems probable here that his heavy frame and his com¬ plexion served to counterbalance the exposure arising from his occupation. No information was secured rela¬ tive to the mother. 170. Case 14. The father, for a period of seven¬ teen years, worked at cutting timber in the woods. This occupation is normally one of exposure to sun¬ light, the degree of which, however, is modified at times by meteorological conditions, and by the amount of foli¬ age above ; the latter in turn varying with the nature of the trees, the seasons, and with the density of the for¬ est. Questions in detail about the man's mate brought out the facf that she was very active, working outdoors a great deal with garden, ñowers, and chickens; she thus subjected herself to a great degree of exposure. It would seem, therefore, that for a long time conditions for this pair were substantially balanced, and there were born 1 Girl 1 Boy 1 Girl 1 Boy. By this time the health of the mother broke and during the remainder of the first period of seventeen years there were born three girls. The father then for the first time in his life entered indoor work in a stove factory in Kokomo, Indiana; after he commenced work in this plant in which conditions of shelter were complete, two . boys were born. While no data were recorded in this case as to weights or complexions of the parents, the sex in the births followed the variations in health con-