flat breasts and coarse skin cannot be expected to have strong
reproductive instincts, since she is largely masculine in type..."

The glandular and quantitative explanation of sex, instead of being
abstruse and complicated, brings the subject in line with the known
facts about inheritance generally. The dual basis for femaleness and
maleness in each individual simply means that both factors are present,
but that only one expresses itself fully. The presence of such a dual
basis is proved by the fact that in castration and transplantation
experiments both are exhibited by the same individual in a single
lifetime. In the case of the Free-Martin cattle, even the female
sex-glands are modified toward the male type to such an extent that they
were long mistaken for testes. The same applies to some glands found in
human "hermaphrodites," as Dr Bell's plates show.

The peculiar complication of the chemical complex determining sex in
these mammalian forms, involving all the glands and hence the entire
body, makes it problematical whether a complete (functional) reversal is
possible, at least after any development whatever of the embryo has
taken place. On the other hand, the fact that such complete
transformations have not so far been observed by no means proves their
non-existence. Their being functional, and hence to all external
appearances normal, would cause such animals to escape observation.

Latent traits of the opposite sex of course immediately suggest
recessive or unexpressed characters in the well-known Mendelian
inheritance phenomena. In the bird-castration cases, we saw that to
remove the inhibiting sex glands caused previously latent characters to
act like dominant or expressed ones. The case of horns in sheep,
investigated by Professor Wood[16], is so similar that it seems worth