When the prepuce of a boy will not glide back, becomes red, sore and swollen, he should ask his father to have a doctor treat him. The doctor will know how to enlarge the opening, break up the adhesion and glide it back. Underneath the penis is a sack, called the (6) scrotum, in which are suspended two glands, called the (7) testicles. The (7) indicates where these glands would be if placed in the cut. Leading off from the (8) descending artery are two small arteries, called the (9) spermatic arteries. They carry pure blood to the testicles. Leading back from the testicles are two small veins that separate from the spermatic arteries and are called the (10) spermatic veins. Connected with each testicle is a duct, called the (11) vas deferens that passes up through the loins and over the bladder and becomes enlarged into a small vessel called the (12) ampulla. The ampullae open into the urethra. Near the ampullae, and behind them, are two larger vessels, called the (13) seminal vessels. These vessels connect with the urethra by a small duct, at the point where the ampullae do. Surrounding the neck of the bladder, the lower portion of the ampullae, the seminal vessels and the deep urethra is a very important gland, called the (14) prostate gland. Connected with the urethra and only a short distance from the prostate, are two small glands, called the (15) Cowper’s glands. These glands and vessels are all very tender. They are protected by being placed on the inside of the body. Because of bad habits connected with the organs on the outside, many men suffer much pain from diseased conditions of the organs on the inside. =Puberty.=--When a boy is born, he has all these organs. The testicles and the glands on the inside are inactive until he reaches the age of fourteen and a half. Until this time he has been only a boy. At about this age the glands become active and begin to slowly form from the blood a fluid called semen. This period in a boy’s life is called puberty. It is at this time that he starts toward manhood. We shall find later that he will not be a perfect man until he is twenty-four. During these ten years he will be changing gradually into a man. There is no way by which a boy can come suddenly to manhood.