It is not at all difficult to imagine. Play, in the first place, and games--in the sunshine and open air. And if the sun isn't shining, on rainy days, more play and games--in the play-room, or about the house, or somewhere under shelter. Marbles and tops and kites; jumping rope, rolling hoops, making pin-wheels; skating, sledding, snow-balling; baseball, fishing, tennis; leap-frog, running, climbing trees; and dozens of other pastimes, too numerous to think of. The very sound of them is healthy and joyous and exhilarating and the general effect of them on a growing nature is just as wholesome. But this is not all, by any means--only one kind of thing, chiefly of value to the physical side of development--health and strength and vitality and cheerfulness. In addition to this, there are many other interests of a different order which may appeal to youth very strongly. A collection of postage stamps, or birds' eggs, or picture cards, may become of absorbing interest to boys and girls, with time on their hands. These may encourage patience and perseverance and observation and enthusiasm, which are most admirable as traits of character. A boy may become deeply absorbed in a set of carpenter's tools and the things he can do with them. He can set his heart on making a pair of stilts, and a boat that will float and steer and sail, and tables and boxes and chests of drawers for his collections--all of which may develop skill and determination and an aspiration to fine accomplishment. And the interest so begun may lead to a bracket-saw and carving tools, or a turning lathe, and the fashioning of more intricate and beautiful things. A boy, or a girl, may have a camera and learn to take pictures and develop them and print them, and encourage in this way the growth of feelings and tastes and much useful knowledge--in addition to mental training. Boys and girls may set their hearts on building a beautiful snow fort--and work and slave and overcome obstacles--until they have given themselves a fine lesson in industry, and the rewards of successful accomplishment. A boy may become interested in a printing press, or a steam engine, or an electric machine of some sort, and acquire by means of it, not only a lot of worthy satisfaction and pleasure, but the enthusiasm of deep, spontaneous feelings--in addition to useful information and mental training. A perfectly normal boy, without any special bent for music, or art, may want to play on a drum, or a banjo--or to paint pictures with water-colors--and through the effort devoted to this want, encourage the growth of tastes and feelings, which may prove of benefit and value, all through life.