Note 50 — PART I. MENSTRUATION.

“The catamenial discharge, as it issues from the uterus [womb], appears to be nearly or quite identical with ordinary blood; but in its passage through the vagina it becomes mixed with the acid mucus exuded from its walls, which usually deprives it of the power of coagulating. If the discharge should be profuse, however, a portion of its fibrin remains unaffected, and clots are formed.”—Dr. Carpenter’s Human Physiology.