Note 155 — Second Part. (continued 2)

That is to say so far as it is suffered to remain for any length of time in the vagina and comes more or less in contact with the atmospheric air; for in the case of healthy menstrual blood no injurious combination is set up at all or any foul acridity developed, as John Stedman (Physiolog. Versuche und Beobachtungen,—Physiological Investigations and Observations, transl. from the English, Leipzig 1778. 8vo., pp. 50-54.) long ago maintained. It is more probable however that any slight putrefactive action occurring is in each case due not so much to this as to the acid quality of the menstrual blood, which in conjunction with the acid vaginal mucus undergoes a kind of acetous fermentation in the vagina, the product of which has thus a corrosive effect. Retzius indeed has lately not only found menstrual blood to possess an exceedingly acid reaction, but even proved that it contains free phosphoric and lactic acids. Comp. Arsberättelse om Svenska Läkare Sällskapets Arbeten, 1835., pp. 19-21. Froriep’s Notiz, Vol. 49., p. 237.