"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.

2. Intense mental excitement, as well as severe physical labor, is to be sedulously avoided during this period. At the time of its first occurrence, special care should be observed in this direction. Intense study, a fit of anger, sudden grief, or even great merriment, will sometimes arrest the process prematurely. The feeling of malaise which usually accompanies the discharge is by nature intended as a warning that rest and quiet are required; and the hint should be followed. Every endeavor should be made to keep the individual comfortable, calm, and cheerful. Feelings of apprehension arising from a continual watching of symptoms are very depressing, and should be avoided by occupying the mind in some agreeable manner not demanding severe effort, either mental or physical.

There is no doubt that many young women have permanently injured their constitutions while at school by excessive mental taxation during the catamenial period, to which they were prompted by ambition to excel, or were compelled by the "cramming" system too generally pursued in our schools, and particularly in young ladies' seminaries. It is not to be supposed, however, that the moderate amount of sound study required by a correct system of teaching would be injurious to a healthy young woman at any time, and we have no doubt that a very large share of the injury which has been attributed to over-study during the catamenia has been induced by other causes, such as improper dress, exposure to taking cold, keeping late hours, and improper diet.

If there is any class of persons deserving of pity it is that large class of girls and young women who are in every large city employed as clerks, seamstresses, flower makers, and in other taxing and confining occupations. In order to keep their situations they are required to be on hand daily, being allowed no opportunity for rest at the menstrual period. In many cases, too, they are compelled to remain upon their feet all day behind a counter, or at a work table, even at periods when a recumbent position is actually demanded by nature. There should be less delicacy in relation to this subject on the part of young women, and more consideration on the part of employers. Here is a field for philanthropic effort which is well worthy of the best efforts of any person of influence who will engage in it.

Custom of Indian Women.—The ease with which Indian women perform the parturient act is proverbial. They suffer scarcely at all from the pains of childbirth; and without doubt one reason of this is the preservation of their sexual health by rest during the menstrual period. At those seasons they invariably absent themselves from the lodge, and enjoy absolute rest. We may readily suppose, from the nature of some of the Mosaic laws, that a custom somewhat similar prevailed among the ancient Hebrew women. If the hardy women of the forest are benefited by rest, certainly our more delicate females may be thus benefited. All need a degree of rest; with some it should be absolute.

The reckless manner in which some young women treat themselves at the menstrual period, is quite appalling to one who is acquainted with the painful and inveterate character of the evils which arise from such abuse. It is no uncommon thing for young ladies to attend balls, visit skating rinks, and otherwise expose themselves to the influences in every way the best calculated to do them the most harm at this particular period, observing not the slightest precaution. Such recklessness is really criminal; and the sad consequences of physical transgression are sure to follow. A young lady who allows herself to get wet or chilled, or gets the feet wet, just prior to or during menstruation, runs the risk of imposing upon herself life-long injury. Mothers should look carefully after their daughters at these periods, and impress upon them the importance of special care.