The bladder of urine is of a tendinous and nervous texture, and capable of great extension, but at the same time exquisitely sensible. The neck of the bladder is very muscular, and by this forms a _sphincter_, or annular muscle, by which the urine is retained; and as it is of a very sensible nature, this part is subject to inflammatory constrictions; great pain, and many evils have there been occasioned, either from venereal cases, or gravelous complaints. From the neck of the bladder to the end of the _penis_, is the _urethra_; which canal serves for the emission of the urine, as well as that of the seed. The whole is lined with a number of very little glans, to lubricate and protect the sensitive lining from the sharpness of the urine. These are the urinary organs. We will in the next place, proceed to the organs of generation. The _testicles_ are the principal instruments for forming the human seed; they are generally two in number. The testicles receive the blood, of which they secrete the seed, from the _aorta_, about the same parts, whence the emulgent arteries project. These arteries run down from the aorta to the testicles, in a very contorted and winding manner, accompanied by the veins which return back again from the testicles, and fix themselves in the ascending _vena cava_. These contorted and interwoven vessels are called the _spermatic vessels_, which carry the blood from the arteries in little quantities, and slowly return it again into the great vein. Whilst the blood is circulated in the testicles, the seed is secreted in them; but as it is secreted, it is transported back again from thence by tubes, called _vasa deferentia_, towards the neck of the bladder, where there are two irregular bladder-like vessels, wherein the seed is contained, and kept for use, called the _vesiculæ seminales_. In these seed bladders the seed is kept for use, till it is wanted. They are remarkably delicate and nervous; and when they are filled with seed, they stimulate all the organs of generation with a desire for venery. The _penis_, or the manly member of generation, is partly covered with the common skin; the foremost part of which, that covers the glans, is called the _præpuce_. This _præpuce_ is tied underneath to the substance of the _penis_, by what is called the _frænum_. The inner part of the penis is composed of two kinds of bodies, the _cavernous bodies_ of the _penis_, and the _cavernous body_ of the _urethra_. The first are bodies enveloped in their peculiar teguments, and make the greatest part of the _penis_. Each of these bodies takes its origin from the erecting muscle of the _penis_, which is near the _pubis_; through each of them goes an artery and a nerve, which spread themselves through these bodies.