The brain of an individual adds no nerve cells after a very early age. The brain increases only very slightly in size and weight after the age of puberty, and then only under special conditions and this increase in weight and size is not due to the addition of any new cells, but simply to a slight increase in the bulk of those cells already present. In a similar way the sexual apparatus undergoes, during the period of puberty (fifteen to seventeen) a very rapid growth, reaching by the end of the period of puberty (seventeenth or nineteenth year) their full size. 4. _Are enlarged veins in the scrotum dangerous?_ Enlarged veins of the scrotum represent dilatation of the veins of the epididymis. These are thin walled vessels that respond to any increased internal blood pressure, perhaps showing a special tendency in this direction during that period of rapid growth of the sexual apparatus in the early part of the adolescent period. If the enlargement is only moderate, it may disappear, or at least become spontaneously arrested in its growth, in which case it need cause no concern. If these veins, however, dilate until they form a considerable mass, known as VARICOCELE, they may affect the sexual apparatus deleteriously in two ways: (1) The increased weight in the scrotal sac may cause the sac to become elongated and to annoy the subject by its traction on the spermatic cord. This lengthened scrotum with its contents may also be exposed to mechanical pressure or even to injury from the clothing, etc., which would not occur if the scrotal sac were short, holding the testes close to the body. (2) Of far more importance is the danger of the varicocele gradually encroaching by pressure upon the testis, perhaps to cause a partial atrophy of that gland. This condition is a comparatively rare one, and inasmuch as it seldom occurs in both testes, the possibility of causing sterility on the part of a man is remote. The extension of the scrotum and the "bearing-down" sensation may be relieved through the wearing of a suspensory bandage. Such a bandage may be obtained at any drug store or surgical instrument house, and if properly fitted, will usually relieve any such discomfort as described above. If the varicocele is quite large, the subject will do well to consult a competent surgeon and to take his advice. 5. _Is the emptying of the seminal vesicles thru nocturnal emission a universal phenomenon among continent men?_