There is, however, another use which is subserved by the testicular
products, a use which may indeed be said to be implied in those uses to
which reference has already been made, but is yet historically the latest
to be realized and studied. It was not until 1869 that Brown-Sequard first
suggested that an important secretion was elaborated by the ductless
glands and received into the circulation, but that suggestion proved to be
epoch-making. If these glandular secretions are so valuable when
administered as drugs to other persons, must they not be of far greater
value when naturally secreted and poured out into the circulation in the
living body? It is now generally believed, on the basis of a large and
various body of evidence, that this is undoubtedly so. In a very crude
form, indeed, this belief is by no means modern. In opposition to the old
writers who were inclined to regard the semen as an excretion which it was
beneficial to expel, there were other ancient authorities who argued that
it was beneficial to retain it as being a vital fluid which, if
reabsorbed, served to invigorate the body. The great physiologist, Haller,
in the middle of the eighteenth century, came very near to the modern
doctrine when he stated in his _Elements of Physiology_ that the sperm
accumulated in the seminical vesicles is pumped back into the blood, and
thus produces the beard and the hair together with the other surprising
changes of puberty which are absent in the eunuch.
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