According to most recent writers, the seminal vesicles of mammals are
receptacles for their own albuminous secretion, the function of which is
unknown. Steinach could find no spermatozoa in these "seminal" sacs, and
therefore he proposed to use Owen's name of _glandulae vesiculares_. After
extirpation of these vesicular glands in the white rat typical coitus
occurred. But the capacity for _procreation_ was diminished, and
extirpation of both _glandulae vesiculares_ and _glandulae prostaticae_ led
to disappearance of the capacity for procreation. Steinach came to the
conclusion that this is because the secretions of these glands impart
increased vitality to the spermatozoa, and he points out that great
fertility and high development of the accessory sexual glands go together.
Steinach found that, when sexually mature white rats were castrated,
though at first they remained as potent as ever, their potency gradually
declined; sexual excitement, however, and sexual inclination always
persisted. He then proceeded to castrate rats before puberty and
discovered the highly significant fact that in these also a quite
considerable degree of sexual inclination appeared.
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