Changes which Occur at Puberty.--The changes which occur in the two sexes at this period have been thus described:-- "In both sexes, hair grows on the skin covering the _symphysis pubis_, around the sexual organs, and in the axillae (armpits). In man, the chest and shoulders broaden, the larynx enlarges, and the voice becomes lower in pitch from the elongation of the vocal cords; hair grows upon the chin, upper lip, and cheeks, and often exists upon the general surface of the body more abundantly than in woman." The sexual organs undergo enlargement, and are more frequently excited. The testicles first begin the secretion of the seminal fluid. "In woman, the pelvis and abdomen enlarge, but the whole frame remains more slender, the muscles and joints less prominent, the limbs more rounded and tapering [than in the male]. Locally, both external and internal organs undergo a considerable and rapid enlargement. The mammae enlarge, the ovarian vesicles become dilated, and there is established a periodical discharge of one or more ova, accompanied, in most cases, by a sanguineous fluid from the cavity of the uterus." These changes, so varied and extraordinary, often occur within a very short space of time; and as they are liable to serious derangement, especially in the female, great care should be taken to secure for the individual the most favorable conditions until they are successfully effected. It is, however, a fact deserving of mention, that many of the ills which are developed at this particular period are quite as much the result of previous indiscretions and mismanagement as of any immediate cause. A few suggestions with regard to the proper treatment of individuals at this age may be in place. 1. Do not allow the boy or girl to be overworked, either mentally or physically. Great and important changes are occurring within the body, and nature should not be overtaxed. 2. Keep the mind occupied. While excessive labor should be avoided, idleness should be as carefully shunned. Some light, useful employment or harmless amusement--better some kind of work--should keep the mind fully occupied with wholesome subjects. 3. Abundant exercise out-of-doors is essential for both sexes. Sunshine and fresh air are as necessary to the development of a human being as for the expanding of a flower bud. 4. Watch carefully the associations of the youth. This should be done at all times, but especially just at the critical period in question, when the general physical disturbances occurring in the system react upon the mind and make it peculiarly susceptible to influences, especially those of an evil character. 5. None too much care can be exercised at this important epoch of human life, provided it is properly applied; but nothing could be more disastrous in its consequences than a weak solicitude which panders to every whim and gratifies every perverted appetite. _Such_ care is a fatal error.