When Daniel Boone was living alone in Kentucky, his intellectual exercises were doubtless of the quiet, slow, heavy character. Other white men joined him. Under the social stimulus, his thinking became more sprightly. Suppose that in time he had come to write vigorously, and to speak in the most eloquent, brilliant manner, does any one imagine that he would have lost in mental vigor by the process? Would not the brain, which had only slow exercise in his isolated life, become bold, brilliant, and dashing, by bold, brilliant, and dashing efforts? A farm-boy has slow, heavy muscles. He has been accustomed to heavy exercises. He is transferred to the circus, and performs, after a few years' training, a hundred beautiful, splendid feats. He at length reaches the matchless Zampillacrostation of William Hanlon. Does any one think that his body has lost power in this brilliant education? Is it true, either in intellectual or physical training, that great exertions, under proper conditions and limitations, exhaust the powers of life? On the contrary, is it not true that we find in vigorous, bold, dashing, brilliant efforts the only source of vigorous, bold, dashing, and brilliant powers? In this discussion I have not considered the treatment of invalids. The principles presented are applicable to the training of children and adults of average vitality. I will rest upon the general statement, that all persons, of both sexes, and of every age, who are possessed of average vitality, should, in the department of physical education, employ light apparatus, and execute a great variety of feats which require skill, accuracy, courage, presence of mind, quickness of eye and hand,--in brief, which demand a vigorous and complete exercise of all the powers and faculties with which the Creator has endowed us; while deformed and diseased persons should be treated in consonance with the philosophy of the _Swedish Movement-Cure_, in which the movements are slow and limited. It is but justice to the following series of exercises with dumb-bells to state that not only are they, with two or three exceptions, the writer's own invention, but the wisdom of the precise arrangement given, as well as the balance of exercise in all the muscles of the body and limbs, has been well proved by an extensive use during several years. By way of illustrating the new system of dumb-bell exercises, I subjoin a few cuts. The entire series contains more than fifty exercises.