3. The third subject of education in Health is the direct cultivation of the various bodily powers in strength, agility, and grace. This culture presupposes close attention to the weak points in the health of each individual student--those tendencies to disease which exist at present in every person. All will have remarked that the same morbid cause, applied to half a dozen people, will produce varying effects, according to individual peculiarities; thus, a current of cold air applied when the body is over-heated may cause either catarrh, bronchitis, neuralgia, rheumatism, intestinal derangement, according to the individual susceptibility. Youthful vitality masks, but does not cure, weak tendencies, unless those tendencies are known, and the exuberant vitality be especially directed to their cure. This season of life is, however, particularly favourable to such cure. Nature will never again present so valuable an opportunity of remodelling the constitution. A doctor of health or preventive medicine, who shall become acquainted with the constitution of each student and determine how far exercise must be modified to meet individual peculiarities, is an indispensable member of the faculty of any college that undertakes to educate in Health. With this observation and caution modern gymnastics and exercise in various forms will become an invaluable part of education. The muscles of the body are capable of the same careful training as the senses. As the eye and hand in painting, or the ear and hand in music, require long and careful practice to acquire skill, so the great variety of delicate or powerful muscles in the human body require careful exercise to draw forth the varied powers that belong to them. The ordinary movements of life do not call forth half these powers. As the large majority of people go through life with only an imperfect use of their lungs, from the constraint of clothing and sedentary habits, which weaken the thoracic muscles, so it is with other organs, and imperfect muscular action and weakened health is the result. The principles of education which are thus laid down are the following, viz.: a constant observance of the order of human growth, the selection of studies that will carry out this order, habits and arrangements of college life that will enforce it, direct instruction in the necessary conditions of health, and careful training of the body. It is giving to education the grandest of all objects--use, which, if properly understood, includes the highest and most permanent culture of which the individual is capable. Were our beautiful sea-coasts studded with such colleges, with their wonderful playgrounds washed twice a day by the Atlantic waves, furnishing endless treasures for the eager gatherers, enthusiasm for health-giving studies would grow up in the youthful mind, and a stronger generation mould a nobler society.