DOISY, EDWARD A. Female sex hormones, by Edward A. Doisy, Philip E. Smith, Robert T. Frank & Elmer L. Sevringhaus. (University of Pennsylvania Bicentennial Conference, M-6-7) © 4Apr41; A152481.

First, the male sex hormones have not the instability nor cyclic rhythmicity of the female.

And since these endocrines control not only physique and physiognomy, anatomic and functional minutiae, but also mind and behaviour, we are justified in putting down the white man's predominance on the planet to a greater all-around concentration in his blood of the omnipotent hormones.