[The Thinking and Feeling Apparatus.]—The brain and nerves afford the means of thinking and feeling, also giving rise to all the activities of the body by the production of nerve force. To aid the brain and nerves, we have special organs provided, termed the organs of special sense; as the eye for sight, the ear for hearing, the nose for the detection of odors, the tongue for tasting, the skin and the mucous membrane for the sense of touch.

[The Purifying Apparatus.]—Waste matter accumulates in the body so rapidly that it is necessary to have abundant and efficient means to remove the same, and prevent death by obstruction. This work is performed by the lungs, liver, kidneys, skin, and mucous membrane.

Each organ and tissue possesses the power to repair itself. Animal heat, which is also necessary to life, is not produced by any special set of organs, but results incidentally from the various other processes named.

[The Reproductive Apparatus.]—As there is a stomach to digest, a brain to think, a pair of lungs to breathe, etc., so there are special organs for reproducing the species or producing new individuals. These organs have been carefully described in the preceding portion of this volume, so that we do not need to repeat the description here. Unlike all the other organs of the body, they are intended for use only after full development or manhood has been attained; consequently, they are only partially developed in childhood, becoming perfected as the person becomes older, especially after about the age of fourteen to eighteen, when puberty occurs. The lungs, the stomach, the muscles, and other organs must be used constantly from the earliest period of infancy, hence they are developed sufficiently for efficient use at birth. The fact that the sexual or reproductive organs are only fully developed later on in life, is sufficient evidence that they are intended for use only when the body has become fully mature and well developed.

[How a Noble Character and a Sound Body Must Be Formed.]—By obeying all the laws which relate to the healthy action of the body and the mind, a noble character and a healthy body may be formed. Any deviation from right will be sure to be followed by suffering. A boy who carefully heeds the advice of good and wise parents, who avoids bad company, who never indulges in bad habits of any sort, who cultivates purity, honesty, and manliness, is certain to grow up into a noble, lovely youth, and to become an intelligent, respected, virtuous man.

[The Down-Hill Road.]—In every large city, and in small ones too, even in little villages, we can scarcely step upon the street without being pained at meeting little boys who have perhaps scarcely learned to speak distinctly, but whose faces show very plainly that they have already taken several steps down the steep hillside of vice. All degrees of wickedness are pictured on the faces of a large proportion of the boys we meet upon the streets, loitering about the corners, loafing in hotels, groceries, and about bar-room doors. Everywhere we meet small faces upon which sin and vice are as clearly written as though the words were actually spelled out. Lying, swearing, smoking, petty stealing, and brazen impudence are among the vices which contaminate thousands and thousands of the boys who are by-and-by to become the men of this country, to constitute its legislators, its educators, its supporters, and its protectors. Is it possible that such boys can become good, useful, noble, trustworthy men? Scarcely. If the seeds of noxious weeds can be made to produce useful plants or beautiful flowers, or if a barren, worthless shrub can be made to bear luscious fruit, then may we expect to see these vicious boys grow up into virtuous, useful men.

But the vices mentioned are not the worst, the traces of which we see stamped upon the faces of hundreds of boys, some of whom, too, would scorn to commit any one of the sins named. There is another vice, still more terrible, more blighting in its effects, a vice which defiles, diseases, and destroys the body, enervates, degrades, and finally dethrones the mind, debases and ruins the soul. It is to this vice that we wish especially to call attention. It is known as

[Self-Abuse.]—Secret vice, masturbation, and self-pollution are other names applied to this same awful sin against nature and against God. We shall not explain here the exact nature of the sin, as very few boys are so ignorant or so innocent as to be unacquainted with it. To this sin and its awful consequences we now wish to call the attention of all who may read these lines.

[A Dreadful Sin.]—The sin of self-pollution is one of the vilest, the basest, and the most degrading that a human being can commit. It is worse than beastly. Those who commit it place themselves far below the meanest brute that breathes. The most loathsome reptile, rolling in the slush and slime of its stagnant pool, would not bemean itself thus. It is true that monkeys sometimes have the habit, but only when they have been taught it by vile men or boys. A boy who is thus guilty ought to be ashamed to look into the eyes of an honest dog. Such a boy naturally shuns the company of those who are pure and innocent. He cannot look with assurance into his mother's face. It is difficult for any one to catch his eye, even for a few seconds. He feels his guilt and acts it out, thus making it known to every one. Let such a boy think how he must appear in the eyes of the Almighty. Let him only think of the angels, pure, innocent, and holy, who are eye-witnesses of his shameful practices. Is not the thought appalling? Would he dare commit such a sin in the presence of his father, his mother, or his sisters? No, indeed. How, then, will he dare to defile himself in the presence of Him from whose all-seeing eye nothing is hid?

The Bible utters the most solemn warnings against sexual sins. The inhabitants of Sodom and Gomorrah were destroyed by fire and brimstone for such transgressions. Onan was struck dead in the act of committing a vileness of this sort. For similar vices the wicked inhabitants of Palestine were destroyed, and their lands given to the Hebrews. For a single violation of the seventh commandment, one of the most notable Bible characters, David, suffered to the day of his death. Those who imagine that this sin is not a transgression of the seventh commandment may be assured that this most heinous, revolting, and unnatural vice is in every respect more pernicious, more debasing, and more immoral than what is generally considered as violation of the commandment which says, "Thou shalt not commit adultery," and is itself a most flagrant violation of the same commandment.