We have intimated that puberty and virility are by no means synonymous terms. The former is a season of change and preparation. The constitution is summoning all its powers to prepare the individual properly to protect and provide for his own wants, and to transmit life to future generations. When the growth is completed, when the beard is grown, and the bones hardened, when the vague and fleeting fancies of youth have been transformed into a well-defined yearning for home and children and a help-meet then the season of virility has commenced. Then, and not before, is it right for the male to exercise those functions peculiarly his own; and then, only when this is accomplished as a subordinate act, conformed to moral and social law, and accessory to pure mental emotions. At the outset of his career let him learn by heart and frequently repeat these words of a celebrated physician, who spoke from a wide study of man in all his relations: " In proportion as the human being makes the temporary gratification of the mere sexual appetite his chief object, and overlooks the happiness arising from spiritual communion, which is not only purer but more permanent, and of which a renewal may be anticipated in another world - does he degrade himself to a level with the brutes that perish."

But the distinctive sign of completed manhood is in the character of the secretion which now commences.

It is not our intention to write upon physiology and anatomy. This would be foreign to a work which proposes to confine itself to the realm of hygiene. And we do not look with favor on those books which by their half-dis-closures and unsavory hints, awaken a useless curiosity, which they do not intend to satisfy. But it seems necessary to speak here with distinctness of one physiological point, because it is intimately connected with the health of the male, and without some clear comprehension of it, much that we shall have to speak of in the nature of warnings and cautions would be unintelligible. We trust that an honest purpose, and scientific accuracy will guide us correctly.

The secretion peculiar to the male, known as the seed or sperm, depends for its life-transmitting power on the presence of certain minute vibratory bodies, about one-fortieth of a line in length, called spermatozoa. These are exceedingly numerous and active when the secretion is healthy. A single one of them - and there are many hundreds in a drop -is sufficient to bring about conception in the female. They not only have a rapid vibratory motion, but singular vitality. The secreted fluid has been frozen and kept at a temperature of zero for four days, yet when it was thawed these animalcules, as they are supposed to be, were as active as ever. They are not, however, always present, and when present may be of variable activity. In young men. just past puberty, and in aged men, they are often scarce and languid in motion. Occasionally they are entirely absent in otherwise hale men, and this is one of the causes of sterility in the male. Their presence or absence can only be detected by the microscope.

The organs in which this secretion is elaborated from the blood are the testicles. Previous to birth, these small rounded, firm bodies are in the abdomen, and only descen a short time before the child is born. They are composed of a vast number or minute tubes united together by connective tissue. The total length of the tubes is estimated at forty-eight hundred feet, or nearly one mile ! Nevertheless, so small are they, that their full capacity is not more than six cubic centimetres.

The left testicle, though usually suspended lower than the right, is somewhat smaller, the difference in weight being about ten grains. The secretion is most active about twenty-five years of age, and decreases after this period as age advances. It is, however, not constant, depending very much on physical and moral causes. In some men it is periodical or intermittent, and they are therefore entirely impotent at times, without at all impairing their vigor at other times.

The testicles are subject to special diseases, which may seriously impair their action. Mumps sometimes changes from the face to them, causing painful swelling, and fre quently a similar attack occurs in venereal diseases. Inflammation may arise from an injury, and also from violent and ungratified sexual excitement. All these affections may lead to loss of power and sterility, and it does not answer, therefore, to neglect them. Diseases which are not connected with the genital organs do not seem to produce any after-influence on the secretion in the adult in middle life, but in aged persons, on the other hand, this is a frequent occurrence.

A secretion is formed before puberty, but it is always without these vibratory bodies. Only after that period is it formed healthily and regularly by the proper glands. This is usually to such an extent that more or less of it passes from the person once in a while during sleep. Thousands of young men ignorantly attribute this perfectly natural evacuation to some weakness of the function. They are in error. Within certain limits, as we shall fully explain hereafter this is a natural, healthy, and necessary effort of the system, quite as much so as an evacuation from the bowels or the bladder. It is to our present purpose to say that moderate flows of this nature area proof of virility, when the secretion thus emitted is of proper character. Observers have noted that that produced soon after puberty is feeble, and generally fruitless, or if capable of fecundating, the child thus produced is weakly, and apt to be exposed to disease.

At the period of virility the desires should not only change in purpose, but they should be less easily excited, more completely under the dominion of reason, more readily sub-jugated than before. It is a gross and dangerous error to suppose that ardent desires are a sign of vigorous health. This is a delusion which should be destroyed. Those men who have the finest physiques, the most athletic frames, and are in thorough "condition," experience least acutely the spur of desire. The ancients frequently refer to the continence of the athletae, and the gymnasts of our cities are always temperate in indulgence. On the other hand, it is a nearly constant symptom of certain dangerous diseases that the passions are unusually easily excited. The first stage of pulmonary consumption is frequently thus characterized, while it is notorious that leprosy, certain obstinate skin diseases, and slow poisoning, especially that by diseased rye-flour, morbidly influence the desires to an extent most damaging to the constitution.