the aid of a powerful microscope, and were first observed in 1677.
Generally speaking, male fertility depends upon the num ber and vitality of these tiny organisms. It is believed that many millions of spermatozoa are given out by a normal healthy man in an ejaculation. The semen is a mixture of secretion from three principal sources—i.e., the testicles, seminal vesicles and prostate.
From the foregoing, it will be observed that the seminal fluid, which starts from the testes, passes into the epididymis, thence through the vas deferens into the seminal vesicles to be stored up for future use. During ejaculation, it passes into the prostatic urethra through the ejaculatory ducts, and thence on its course from the penis through the urethra proper.
THE INTERNAL CHEMISTRY
The Ductless Glands. As important as is the seminal secretion, the internal secretion (hormone) is even more vital to the individual. A man may be sterile—that is, incapable of becoming a father—and still be a fine physical specimen of manhood, with an equally vigorous mentality.
A man, however, who lacks the internal sexual secretion, whether congenitally, through disease, or deprivation by surgical operation, loses the source of the physical attributes of manhood and psychic maturity.
The effect of loss of the male internal sexual secretion can best be observed on eunuchs—men who have been deprived of their testicles. Authorities who have made a special study of eunuchs declare they are generally characterized by mental inactivity, timidity, lack of enterprise, selfishness, envy, fanaticism, mysticism—a mixture of childish and neuter-sex
