The irritation produced or kept up by too frequent coition, is very often the cause of sterility. Even as, generally speaking, an inflamed surface refuses to absorb substances applied to it, so irritation of the uterus and vagina renders them unfit for impregnation. Thus, then, libertinism, instead of adding, as we might think, to the chances of fecundation, acts in a contrary manner. Marc remarks, that two hundred public girls do not produce more than two or three children annually. Farther: it seems well ascertained, that if these girls resume a regular life, they again become fruitful. The English, wishing to people Botany Bay, transported there a large number of public women. Those who were sterile in their own country proved fruitful, when subjected to the rigid laws of marriage. Is it not notorious, too, that among the public girls, those who bear children are not those most frequently liable to become mothers? De Chanes, physician at Macon, has established, by statistical researches, that but few conceptions take place in the early months of marriage--that is, when the congress of the sexes is most frequent, and causes the most irritation. Villermé has ascertained the same to be true in the early days, and even the early weeks, after marriage. Hence, this learned physician regards the fecundity of copulations as being inversely as their frequency. It may, then, be stated as a fact, that females may become barren, in consequence of venereal abuses. These abuses are not only injurious, as opposing reproduction, but they also injure, by causing a deterioration of the human family. Marc asserts, that the few children born of prostitutes rarely have the strength and health of those born in lawful wedlock; and that the mortality of the former is fifty per cent greater than of the latter. Too early marriages are attended with results similar to those arising from libertinism. Aristotle mentioned this fact. Delafontaine, first surgeon of the last king of Poland, attributes the extreme physical debility of the Polish Jews to these premature marriages. Marc says--It is proved, that the physical strength of the child depends, in the main, on the mother, rather than on the father; and this is confirmed, too, by referring to domestic animals. The height of the pony depends on the mare, rather than on the stallion. Mules, too, furnish a striking proof of this. The eggs of pullets, whatever may be the size of the cock, are much smaller than those of hens. Farther: it is well known, that females who become mothers before attaining their strength, generally give birth to small children, which are raised with difficulty.