The Ovaries are two bodies of a flattened or oval form, one of which is situated on each side of the uterus at a little distance from it, and about as high up as where the uterus becomes narrow to form its neck. The longest diameter of the ovarium is about an inch. Each ovarium has a firm coat of membrane. In those who have not been pregnant, it contains from ten to twenty _vesicles_, which are little round bodies, formed of a delicate membrane, and filled with a transparent fluid. Some of these vesicles are situated so near the surface of the ovarium as to be prominent on its surface. They are of different sizes, the largest nearly a quarter of a inch in diameter.* * The vesicles here mentioned are the so-called Graafian vesicles, or ovisacs, each of which contains in its interior a little ovum or egg. In the human female the ovum is extremely minute, so as only to be visible with the aid of a lens. The Graafian vesicles are not limited to a certain small number, as was formerly thought, but continue to be formed in the ovaries, and to discharge at intervals mature ova during the whole of the fruitful period.--G. R. In those in whom conception has ever taken place, some of these vesicles are removed, and in their place a cicatrix or scar is formed which continues through life. However, the number of cicatrices does not always correspond with the number of conceptions. They often exceed it, and are sometimes found where conception has not been known to take place. The Fallopian Tubes are two canals four or five inches in length, proceeding from the upper angles of the cavity of the uterus, in a transverse direction in respect to the body. Having so proceeded for some distance they turn downward toward the ovaries. At their commencement in the uterus they are very small, but they enlarge as much as they progress. The large ends, which hang loose, terminate in open mouths, the margins of which consist of fimbriated processes, and nearly touch the ovaria. We are now prepared to treat of conception. Yet, as menstruation is closely connected with it, and as a knowledge of many things concerning menstruation may contribute much to the well-being of females, for whom this work is at least as much designed as for males, I shall first briefly treat of this subject. Menstruation.--When females arrive at the age of puberty they begin to have a discharge once every month, by way of the vagina, of the color of blood. This discharge is termed the menses. To have it is to menstruate. The age at which menstruation commences varies with different individuals, and also in different climates. The warmer the climate the earlier it commences and ceases. In temperate climates it generally commences at the age of fourteen or fifteen, and it ceases at forty-four, or a little later. *