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23z Boy Scouts ,,' and endurance. A boy scout should have at l?t nine or ten hours sleep out of every twenty-four. If you ?ose out on this amount on one day, make it up the next. Whe]?ever unusually tired, or when you feel out of trim, stay in ?ed a few hours more if it is possible. A boy should wake up e?ch morning feel- ing like a fighting cock. When he doesn't h? ought to' get to bed earlier that night. Sleep is a wonderf? restorative and tonic. It helps to store up energy and conserve strength. Sleeping Out of Doors The conditions under which one sleeps are as .reportant as the length of time one sleeps. Many people are finding it wondedully helpful and invigorating to sleep out of doors. Often a back porch can be arranged, or, in summer, a tent can be pitched in the yard. But, by' all means, the sleeping room should be well ventilated. Windo ws should be thrown wide open. Avoid drafts. If the bed is in such relation to the windows as to cause the wind to blow directly on it, a screen can be used to divert it or a sheet hung up as protection. Good, fresh, cool air is a splendid tonic. In winter open windows are a splendid preparation for camping out in summer. Conservation In this chapter much has been said of. the active measures which a boy should take in order to become strong and well. We should be equally concerned in saving and storing up natural forces we already have. In the body of every boy, who has reached his teens, the Creator of the universe has sown a very important fluid. This fluid is the most wondedul material in all the physical world. Some parts of it find their way into the blood, and through the blood give tone to the muscles, power to the brain, and strength to the nerves. This fluid is the sex fluid. When this fluid appears in a boy's body, it works a wonderful change in him. His chest deepens, his shoulders broaden, his voice changes, his ideals are changed and enlarged. It gives him the capadty for deep feeling, for rich emotion. Pity the boy, therefore, who has wrong ideas of this important function, because they will lower his ideals of life. These organs actually secrete into the blood material that makes a boy manly, strong, and noble. Any habit which a boy has that causes this fluid' to be discharged from the body tends to weaken his strength, to make him less able to resist disea?se, and? often unfortunately fastens upon him habits ?hlt?tbt?t?i?1t? he