The Testicles are of an oval Figure, about the size of a Pigeons Egg, and in some larger: They are wrapt up in five Coats or fine Skins, _viz._ The _Scrotum_, _Dartos_, _Eritroides_, _Elitroides_, and the _Albuginea_; the two first are call’d common, and the three last are call’d proper. The outer Coat is shrivell’d and encompass’d with thin Hair. The Substance of the Testicle, is white, soft, and loose, compos’d of several small Seminals Vessels, and Capillaries, which are the Branches of the Arteries, Veins, Nerves, and Lymphatick Vessels. There are two Muscles call’d _Cremasters_, which keep the Stones suspended; and if these happen to be stronger than ordinary, they’ll move the Testicles of themselves. The most volatile part of the Blood is strain’d out from the rest by the Glandulous Pith of the Testicle, which gives passage only to the finest Particles, and obliges the rest to return to the Veins. This part of the Blood thus filtrated, is rais’d to a just degree of perfection by the length of the Pipes, through which it passes; and what adds to its refinement is the windings of these Pipes, which procure a mutual disunion, by whirling about. When the Seed is prepar’d, it is lodg’d in the expansion of the _Vasa Deferentia_; being first put in motion by the Heat of the Vein call’d the _Spermatick Artery_; and when the Imagination is enflam’d by amorous Thoughts, it suddenly breaks forth. The _Vasa Deferentia_ are Vessels seated partly in the _Scrotum_, and partly in the _Abdomen_; they convey the Seed by drops to the seminal Vesicles; the two extremities of the _Vasa Deferentia_ are compar’d to a Bunch of Grapes, and Guts of Birds. Two small Ducts of about an Inch in length, spring from these Vesicles; they are broad near the Vesicles, but dwindle as they approach to the _Urethra_, which they perforate. These Ducts are call’d Ejaculatory Vessels, because in the heat of Action, they throw the Seed of the Vesicles into the _Urethra_, and they are the chief Subjects of the pleasure attending Ejaculation. These small Ducts have ten or twelve Orifices, opening to the _Urethra_, each of them being shut by a small Caruncle to prevent the continual efflux of Humour, which has the precedency of the Seed. This is alledg’d to be the seat of a Clap, by reason volatile Salts fastning near, occasion Ulcers that corrode the Caruncles, and thereupon the Orifices of the Ducts discharge their slimy Liquor. The _Prostatæ_ are two Glandulous spungy Bodies, seated at the root of the Yard, by the head of the _Urethra_, and furnish’d with Arteries from the _Pudendæ_; their use is to make a secretion of slimy oily Liquor out of the Blood, to reserve it for some time in its Vesicles, and to squeeze it out by degrees, thro’ the Pipes of the small Ducts, to the _Urethra_.