distended, as in hernia or hydrocele, to the size of a melon. The contractile powers of the scrotum have been assigned to the supposed presence of a muscle, which is merely a thickened cellular membrane, and called Dartos. It was stated that the testicles were suspended by their spermatic chords—their support is rendered more perfect by the presence of a muscle to each, that descends into the scrotum, and which is called the Cremaster—it is an expansion of one of the muscles of the abdomen, called the internal oblique, and it spreads itself umbrella fashion around the chord, over the upper part of the testicle, and its fibres extend ray-like over the other coats of the testicle—its office is to draw up the seminal organs during procreation. The testicles, thus suspended, have two coats, one adhering closely, and the other loosely surrounding the former—between the two, a lubricating fluid is secreted, whereby the various movements of the body are permitted without injury; it is between these coats that water is secreted occasionally, constituting the disease known as hydrocele. The closely fitting coat is termed from its whiteness and density Tunica Albuginea—the other Tunica Vaginalis. These coverings are formed of that extensive membrane in the abdomen called the Peritonœum. The Tunica Albuginea which surrounds the testicle previous to its descent, accompanies it into the scrotum, propelling, as it were, the Tunica Vaginalis before it. On the descent of the testicles into the scrotum, the opening through which they passed becomes impermeably closed. The annexed diagram will explain the coats and facilitate the understanding of subsequent descriptions. [Illustration: 1. Body of the Testicle. 2. Epididymis. 3. Vas Deferens. 4. Spermatic Artery. 5. Veins. 6. Cremaster Muscle. 7. Tunica Albuginea. 8. Tunica Vaginalis. 9. Scrotum. 3, 4, 5, 6, and 8 constituting the Spermatic Chord.] When the coats of the testicle are taken off, it is found to consist of innumerable delicate white tubes, which when disengaged from the cellular membrane that connects them together, and steeped in water, exhibit a most astonishing length of convoluted vessels; they appear to consist of one continuous tube, convoluted in partitions of the cellular membrane. When the _Tubuli_ come out from the body of the testicle, they run along the back of it and form a net work of vessels called Rete Testis; it is supposed that by the net work the semen is conveyed from the testicle. The continuations of this _Rete Testis_ have been denominated _Vasa Deferentia_, which, ending in a number of _Vascular Cones_, constitute what is called the Epididymis. The _Vasa Deferentia_, after forming three conical convolutions, unite and form larger tubes, which ultimately end in one large excretory duct, called the Vas Deferens. The following description relates to the accompanying sketch.