5. None too much care can be exercised at this important epoch of human

life, provided it is properly applied; but nothing could be more disastrous in its consequences than a weak solicitude which panders to every whim and gratifies every perverted appetite. _Such_ care is a fatal error. Menstruation.--The functional changes which occur in the female are much more marked than those of the male. As already intimated, the periodical development and discharge of an ovum by the female, which occurs after puberty, is accompanied by the discharge of a bloody fluid, which is known as the _flowers_, _menses_, or _catamenia_. The accompanying symptoms together are termed the process of _menstruation_, or _being unwell_. This usually occurs, in the human female, once in about four weeks. In special cases, the interval may be a week less or a week longer; or the variation may be even greater. Dalton describes the process as follows:-- "When the expected period is about to come on, the female is affected by a certain degree of discomfort and lassitude, a sense of weight in the pelvis, and more or less disinclination to society. These symptoms are in some cases slightly pronounced, in others more troublesome. An unusual discharge of vaginal mucus then begins to take place, which soon becomes yellowish or rusty brown in color, from the admixture of a certain proportion of blood; and by the second or third day, the discharge has the appearance of nearly pure blood. The unpleasant sensations which were at first manifest, then usually subside; and the discharge, after continuing for a certain period, begins to grow more scanty. Its color changes from a pure red to a brownish or rusty tinge, until it finally disappears altogether, and the female returns to her ordinary condition." The menstrual function continues active from puberty to about the forty-fifth year, or during the period of fertility. When it finally disappears, the woman is no longer capable of bearing children. The time of disappearance is termed the "change of life," or _menopause_. Exceptional cases occur in which this period is greatly hastened, arriving as early as the thirty-fifth year, or even earlier. Instances have also been observed in which menstruation continued as late as the sixtieth year, and even later; but such cases are very rare; and if procreation occurs, the progeny is feeble and senile. With rare exceptions, the function is suspended during pregnancy, and usually, also, during the period of nursing. Nature of Menstruation.--There has been a great amount of speculation concerning the cause and nature of the menstrual process. No entirely satisfactory conclusions have been reached, however, except that it is usually accompanied by the maturation and expulsion from the ovary of an ovum, which is termed ovulation. But menstruation may occur without ovulation, and, _vice versa_. Menstruation is not peculiar to the human female, being represented in the higher animals by what is familiarly termed the "rut." This is not usually a bloody discharge, however, as in the human female, though such a discharge has been observed in the monkey. It has been quite satisfactorily settled that the discharge of the ovum from the ovary generally takes place about the time of the cessation of the flow. Immediately after the discharge, the sexual desires of the female are more intense than at other times. This fact is particularly manifest in lower animals. The following remark by Prof. Dalton is especially significant to those who care to appreciate its bearing:-- "It is a remarkable fact, in this connection, that the female of these [domestic] animals will allow the approaches of the male only during and immediately after the oestrual period [rut]; that is, just when the egg is recently discharged, and ready for impregnation. At other times, when sexual intercourse would be necessarily fruitless, the instinct of the animal leads her to avoid it; and the concourse of the sexes is accordingly made to correspond in time with the maturity of the egg and its aptitude for fecundation." The amount of fluid lost during the menstrual flow varies greatly with different individuals. It is estimated at from three ounces to half a pint. In cases of deranged function, it may be much greater than this. It is not all blood, however, a considerable portion being mucus. It is rather difficult to understand why the discharge of so considerable a quantity of blood is required. There is no benefit derived from a very copious discharge, as some suppose. Facts seem to indicate that in general those enjoy the best health who lose but small quantities of blood in this manner. A Critical Period.--As the first occurrence of menstruation is a very critical period in the life of a female, and as each recurrence of the function renders her especially susceptible to morbid influences, and liable to serious derangements, a few hints respecting the proper care of an individual at these periods may be acceptable. Important Hints.--1. Avoid taking cold. To do this, it is necessary to avoid exposure; not that a person must be constantly confined in a warm room, for such a course would be the surest way in which to increase the susceptibility to cold. Nothing will disturb the menstrual process more quickly than a sudden chilling of the body when in a state of perspiration, or after confinement in a warm room, by exposure, without sufficient protection, to cold air. A daily bath and daily exercise in the open air are the best known means of preventing colds.