Of course I, in the first place, address myself to parents and to all those who are interested with the care of youth; and here I would observe that, for the most part, a long life of health and happiness is utterly unattainable, save through the medium of a pleasant and systematic course of physical culture or training, to be observed from early youth to manhood, and from this latter to the utmost limits of our declining years. It will, however, be readily perceived that this system of training must be such as to adapt itself to the necessities of the various physiques and natures which so widely characterize all communities; and that care must be taken not to confound these different constitutions one with the other. Plenty of pure, fresh air, and gentle exercise, a sufficiency of plain, wholesome and suitable food; the proper quantity of sleep, and a judicious use of the sponge and slightly tepid or not absolutely cold water, are the starting points for the young on the way to health and strength, and the possession of a physique capable of the greatest endurance, and of ministering, in the highest degree, to the realization of those mental and sensuous enjoyments which so crown the sum of our earthly happiness. During the period of dentition, or for the first ten years, as Flourens has it, great care must be taken not to overtax the brain or the physical organs of the child to any extent whatever. While yet in the arms of the nurse, the babe should have an abundance of open air sunlight in mild weather, and, when practicable, be permitted to inhale the pure, fresh country breezes. This, when supplemented by the nutritious element of a mother's milk only, will lay the first, sure stone in the foundations of future health and strength, and soon enable the little prattler to move about unsupported as best he can, until, at last, he takes to his feet and, prompted and sustained by more solid, but yet simple food, begins to shift for himself on a small scale. As he grows up, and his bones and muscles begin to assume consistence, care must be taken that he is never permitted to remain long standing on his feet at one time, as the superincumbent weight of his, or her, body, as the case may be, tends to bow the legs, and thereby destroy the symmetry of the whole form. It is because of the neglect of nurses in this relation that we meet with so many persons who are rendered physically incapable of stopping a cat in even the narrowest passage, and that are neither more nor less than deformed for life. The wooden walking-frame on wheels, to which the child clings, must not be placed too near the cradle. No child should be entrusted to his legs before he is a year old, and then only for a short period at a time, as just observed.