Google turns up a source for the “women of genius” quote, a book “Sex Differences in Cognitive Abilities” by D. Halpern. The book’s quote is from someone named Bayertahl, and it’s an indirect quotation from a 1989 article, “Sexual Dimorphism in the Human Brain: Dispelling the Myths” supposedly by a J. Janowsky. I say supposedly because looking for a fulltext leads me to a version with a similar title (“Sexual Dimorphism of the Human Brain: Myths and Realities”) but is by M. A. Hofman and D. F. Swaab; it contains the Bayertahl quote in the original German and says that the primary source is this 1932 article by a Louis Bolk, “Hersenen en Cultuur” (Brains and Culture). This is also a full text, in Dutch; Google’s translation seems to roughly confirm the claim as reported by Warwick (though the “women of genius” quote does not seem to appear in Bolk’s article, at a first cursory glance).
Google turns up a source for the “women of genius” quote, a book “Sex Differences in Cognitive Abilities” by D. Halpern. The book’s quote is from someone named Bayertahl, and it’s an indirect quotation from a 1989 article, “Sexual Dimorphism in the Human Brain: Dispelling the Myths” supposedly by a J. Janowsky. I say supposedly because looking for a fulltext leads me to a version with a similar title (“Sexual Dimorphism of the Human Brain: Myths and Realities”) but is by M. A. Hofman and D. F. Swaab; it contains the Bayertahl quote in the original German and says that the primary source is this 1932 article by a Louis Bolk, “Hersenen en Cultuur” (Brains and Culture). This is also a full text, in Dutch; Google’s translation seems to roughly confirm the claim as reported by Warwick (though the “women of genius” quote does not seem to appear in Bolk’s article, at a first cursory glance).
This cites “Bayerthall 1911”.