or folds, which are plainly discernable to the ordinary view; then the Labia Minora, or smaller inner "lips" or folds, and the Clitoris or small sensitive organ, and the Meatus Urinarius or urinary orifice, all of which are discernable only when the folds of the Labia Majora are parted or opened. Then, proceeding upward and backward from the Vaginal Orifice, we find the Vagina, or channel or canal leading to the Uterus or Womb; then we find the Uterus or Womb at the upper end of the canal or channel of the Vagina. Then extending from either side of the Uterus or Womb we find those two important sets of organs known as the Fallopian Tubes, and the Ovaries, respectively. The Ovaries discharge their ova, or eggs, into the Fallopian Tubes, from whence they are conveyed to the Uterus or Womb, with which the tubes are connected and into which they open at its upper and large end.

The Pelvis is that bony arch in the cavity of which are contained the internal sex organs of the woman. The Pelvis is a bony basin which holds and supports the pelvic organs, and is composed of three important parts, as follows: (1) The Sacrum, consisting of five sections of the vertebral column, or spine, fused together so as to constitute the solid part of the lower spine and the back of the Pelvis; (2) the two Hip-Bones, one on each side of the Pelvis; (3) the Pubic Arch, or the front part of the Pelvis, formed by the junction of the two Hip-Bones in front. Attached to the Hip-Bones are the thighs, and also the large Gluteal Muscles which constitute the buttocks, or "seat."

The Pelvis of the woman is quite different from that of the man. It is shallower and wider, and lighter in structure than that of the male, and the margins of the Hip-Bones are more widely separated, thus making the hips of the woman far more prominent than those of the man. Also, the Sacrum is shorter than that of the man, and the Pubic Arch wider and more rounded than his. This difference in the bony structure is made necessary by the demand for larger space in the female Pelvis required for the purposes of childbirth. These differences are not so perceptible in childhood, but become marked and pronounced at puberty.

LESSON III
PHYSIOLOGY OF THE FEMALE SEX ORGANISM

In the preceding lesson you have been shown "just what" each one of the sex organs of the woman is. In the present lesson you will be shown "just what" each of these organs does—what its functions and offices are. The preceding lesson dealt with the anatomy of these organs; the present lesson will deal with the physiology thereof.

Beginning with the Ovaries, the fundamental and basic sex organs of the woman, you will have explained to you the wonderful processes performed by each of these organs in turn.

The Ovaries. The Ovaries in the woman are akin to the testicles in the man. Without the Ovaries there would be no ova or eggs, and without the ova there would be possible no reproductive purposes, and therefore no office for the sex organs at all, for reproduction is the fundamental office, function, and purpose of the entire sexual organism.

In our consideration of the office, purposes, and functions of the Ovaries, however, we must not overlook a certain secondary phase of such functioning. While it is true that the primary purpose of both the testicles of the male, and the Ovaries of the female, is that of providing seed from which the offspring of the individual may be produced, it is likewise true that there exists a secondary purpose which may be called the "individual" purpose as contrasted with the "racial" and primary one.

This secondary or "individual" purpose of the Ovaries is that of manufacturing certain secretions which are absorbed by the blood of the woman, and which play an important part in her physical and mental well-being and activities. These secretions begin before puberty in the woman, and continue after her menopause; whereas the manufacture of the ova begins only at puberty, and ceases with the menopause, keeping pace with the manifestation of menstruation in its beginning and its ending.

Nature provides these chemical secretions from the Ovaries for the purpose of giving the woman her characteristic physical form and contour, her form, her breasts, her long hair, her broad pelvis, her soft voice, and other secondary sex characteristics; and also of providing for the normal development of the other sex organs. As a proof of this statement, science shows us that if a woman's ovaries are completely removed there is usually a consequent atrophy or "drying up" of the Uterus and the Vagina, and often even of the Vulva. Moreover, the presence of this internal secretion manifests in arousing and maintaining in the woman her normal sexual desire, and her normal pleasure in the company of her mate; it being noted that if the ovaries are removed, particularly in early life, the woman is apt to lose all sexual desire and normal womanly feeling toward the other sex. And, finally, these secretions make for general physical and mental health and well-being in the woman, and contribute to her vivacity, energy, and activity in all directions. As writers on the subject have well pointed out, this is the reason that capable surgeons usually try to leave at least a portion of the Ovaries when performing an operation for the removal of those organs on account of diseased condition.

The Ovum. The Ovum, or human egg, is a small spherical body, measuring from one two-hundred-and-fortieth to one one-hundred-and-twentieth of an inch in diameter. It has a colorless transparent envelope, the latter enclosing the yolk which consists of granules or globules of various sizes embedded in a viscid fluid. In the center of the yolk is found a very small vesicular body consisting of a tenuous transparent membrane, which is known as "the germinal vesicle;" this, in turn, contains a very tiny granular structure, opaque, of yellow color, known as "the germinal spot."

When the time is reached in which the ovum or egg is to be discharged, the Graafian follicle becomes enlarged by reason of the accumulation of the fluids in its interior, and exerts such a steady and increasing pressure from within, outward, that the surrounding tissue yields to it, and it finally protrudes from the Ovary, from whence it is then expelled with a gush, owing to the elasticity and reaction of the neighboring tissues.

Following this rupture there occurs an abundant hemorrhage from the vesicles of the follicle, the cavity being filled with blood, which then coagulates and is retained in the Graafian follicle. The formation and development of the Graafian follicle begins at puberty and continues until the menopause or "change of life" of the woman. Many follicles are produced, but many do not produce ova, and so gradually atrophy. The ripening and discharge of the eggs produce a peculiar condition of congestion of the entire female sexual organism, including the Fallopian Tubes, the Uterus, the Vagina, and even of the Vulva, which results in a condition of Sexual Excitement. Among the lower animals the female will allow the male to approach her for copulation only at this period, this being the time when the egg is ready for fertilization.

When the female infant is born, her Ovaries contain the germs of about 100,000 ova. The greater portion of these, however, disappear, until at the time of her puberty the number of germs of ova contains only about 30,000 ova. This number is far more than the woman will ever need, and is Nature's provision against diseased portions of the Ovaries, accidents, etc. Only one ovum ripens and matures each month from puberty until