_Pure Air and Exercise._—This is very necessary; impure and confined air with the want of exercise, causes disease; and hence children in cities are more pale, feeble, and sickly than those who live in the country and breathe pure air and play in the dirt. Confining children at home, in low, confined, dirty houses, cellars, and in school-rooms, is pernicious; also crowding too many in sleeping-rooms. When children are confined in small apartments, the air not only becomes unwholesome, but the heat relaxes their solids, renders them delicate, and disposes them to colds and many other disorders. Nor is the custom of wrapping them too close in cradles less pernicious. One would think that nurses were afraid lest children should suffer by breathing free air, as many of them actually cover the child’s face while asleep, and others wrap a covering over the whole cradle, by which means the child is forced to breathe the same air over and over all the time it sleeps. Children, therefore, must have as much _exercise_ and _air_ as possible, and should be employed in something useful and interesting. Again; “The premature exertion of intellect to which the mind is stimulated at our schools, by the constant emulation and vanity, far from strengthening, tends to impair the health and tone of the brain, and of all the organs depending on it; and hence we rarely perceive the genius of the school manifesting in future years any of the superiority which attracted attention in early life.” BARRENNESS. Sterility proceeds from either a temporary or permanent incapability of conceiving or retaining the embryo, till it acquires a form. The causes producing this incapability, may consist in some malformation or deficiency of the womb, or its appendages, which cannot always be discovered during life, or in merely a weakness in the action of the womb. This last is by far the most frequent cause, and it is occasioned by local weakness of the womb, or general affections of the whole system; and is marked usually by an obstruction, deficiency, or redundancy of the menstrual evacuation, or by the complaint termed female weakness. It may be considered as highly probable, that the absence of the capacity to be impregnated, will sometimes depend upon the imperfect condition of either the uterus itself or of the ovaries. If the former, it may consist in some derangement of the secreting surface of this organ; for, though there may be a regular discharge of a colored fluid, and this so nearly resembling the perfect secretion as to deceive the senses, it may yet want an essential condition or quality, and thus entail barrenness—hence, all women are not fruitful who may have a regular catamenial discharge; though, as far as can be determined by appearances, this discharge is every way healthy, and at the same time, the ovaries free from fault.