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As the body-growth ceases in adolescence, the nutritive surplus no longer used in growth overflows periodically through the genital organs. Thus during the week preceding the menstrual flow, a woman's weight increases from 3 to 7 pounds, this increment being lost soon after the advent of the flow. In certain lower animals the discharge of ova and spermatozoa is as plainly excretory as is the voiding of urine in higher forms; even in frogs and fishes the testis discharges its spermatozoa and the kidney its urine through one and the same channel; in the very kind of beasts, man himself, while the kidney is provided with a new and private sewer, the ureter, the testis continues to use the frog's old urinary duct, now called epididymis and vas deferens. This excretory function of the testis and its duct illumines both its intimate alliance with the kidney and its frequent infection
BELFIELD WT. SOME CAUSES OF STERILITY AND IMPOTENCE IN THE MALE. JAMA. 1912;LIX(16):1419–1421. doi:10.1001/jama.1912.04270100187001
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