One of the main “clearing houses” of the body, by which the blood is constantly cleared of much of its poisons, is the liver. The minute cells of this organ each have their individual work to perform in transforming the poisonous material into harmless substances. The cells of this “clearing house” are delicate little organs, and will not stand abuse. All habits having a tendency to cause dyspepsia――eating rapidly, eating indigestible food, constant and intemperate use of alcohol or the use of tobacco in the youth――disturb the normal work of the liver. Hence, one of the first aims of a boy who desires to be a strong man――and what boy does not have this admirable aim?――should be to keep the liver in the best possible condition. Any clogging or disturbance of the ordinary work of the liver prevents the blood from being in a pure state. All parts of the body will show distressing symptoms of fatigue and exhaustion if the little cells of the liver have become diseased or useless through intemperate living and ignorance of the duties belonging to each separate organ of the human body. In general terms I have given you some facts necessary to know if you wish to reach full manhood in perfect health and with all the organs so adjusted that the human machine in you will work the rest of your long life without squeaking and rattling. But there are many little details for you to know in order to keep the adjustment perfect and to increase the power and energy in you――mental and physical. Too many boys and youths have never been taught how to get the best that is in them to work――to be a success because they are doing what is in them to do and are happy in doing it――this is what means success. I shall try in the next chat to go into some of these details, and so on up to the most important facts in life. To give you a comprehensive knowledge of your sex organs, how to care for them, what Life means, and in all matters that go to make up the normal man. To give you instruction that makes a man, produces the character of the man of honor, to give you the inward grace of a gentleman, which cannot manifest itself outwardly save in good manners, modesty of bearing and fearlessness. And so many of these qualities depend inwardly upon a perfect adjustment of all your organs. You shall be told all about differences of man and woman; why you should be at all times kind and considerate to the girls and women――in fact what the world means in its development and what you can do to assist in its better development. CHAPTER II THE OUTSIDE LUNGS――THE SKIN I have told you that next to the lungs the greatest breathing organ of the body is the skin. The great importance of this fact has been overlooked by many of your school teachers and parents――that is, from the boy’s standpoint.