The penis in its flaccid state varies considerably in size, due not only to varying conditions of temperature but also to individual peculiarities. The organ may vary between 2-1/2 inches and 6 inches in length in the flaccid state and between 5 inches and 8 inches in the erected condition. The size of the generative organs is not an index of virility in the male. The _testes_ are the male generative glands and are described as about 1-1/2 inches in length, 1-1/4 inches in width and nearly 1 inch in thickness. The testes are contained within the scrotal sac, the outside coat of which is a thin wrinkled skin, within which are four thin coats. Next to the testes and enveloping the spermatic cord is a thin covering which is carried down into the scrotum when the testicle leaves the abdomen, where it is formed. This descent of the testes from the abdomen takes place normally in the later weeks of intrauterine life. The testes may, however, through some unusual condition, be retained and make their descent months or even years later. If the testes have not descended by the end of the age of puberty, the advice of a competent surgeon should be sought. { TESTICULAR { SPERMATOZOA { CONTRIBUTION. { SEMINAL GRANULES { { MUCIN AND WATER { SEMEN { VESICULAR { ALBUMIN { CONTRIBUTION. { ALKALINE SALTS { (In quantity greater { WATER { than all the rest.) { { PROSTATIC { PROTEINS { CONTRIBUTION. { ALKALINE SALTS { (Viscid and opalescent.) { WATER [Illustration: Plate II Male Sexual Apparatus] The outer coat of the testis is called the tunica albuginea. [See Plate 2.] This tunic or coat sends fibrous partitions into the testis which divide the organ into lobules, each one being conical in shape with the apex directed towards the epididymis, which is that mass of blood vessels and tissues which one can feel on one side of each testis. Within these lobules the spermatozoa are formed by a complex process of cell division and cell germination upon whose description we need not enter here. The _spermatozoon_ may be described as the male sexual cell whose function is to fertilize the female ovum. The spermatozoon is about 1/20 of an inch in length and consists of a head, body and a vibratile tail. In the human spermatozoon the head is ovoid, appearing pear-shaped or pointed in one view and elliptical in another.