2) It may be reflected off the glans before reaching this point, and become continuous with or adherent to the skin lining. In this case the glans will not be completely covered by the mucous membrane, because a small portion will have been cut off in the first stage of the operation. In those cases the membrane missing from the upper part of the glans will be found on the inside of the amputated foreskin. 3) In other cases this inner mucous membrane is very deficient covering only three quarters or less of the surface of the glans, the remaining portion being adherent to the inner surface of the foreskin. The _consistence of this membrane_ is such that it can be easily torn through but, 1) It may be elastic so that it stretches without tearing. 2) It may be so thin that it is liable to be pushed down by the nails instead of being torn. 3) It may be so thick as to necessitate the use of the scissors to cut it. It may be loosely applied to the glans so that the thumb nails are easily inserted beneath it, or it may be so adherent that great difficulty is experienced in tearing it through and peeling it off the glans. An important fold of this membrane, triangular in shape is attached to the under surface of the glans below its base reaching almost up to the opening of the urethra. This is called the _Frænum_, and it is fully exposed during the second stage of the operation. The body of the penis itself is composed of three parts. On the upper surface behind the glans are the two _Corpora Cavernosa_, united firmly together, but leaving a hollow on their under surface for the _Corpus Spongiosum_ which is prolonged beyond them in an enlarged extremity known as the _glans_. The constriction beneath the glans is called the _Cervix or Neck_, while the projecting rim of the glans above this is called the _Corona_. Occasionally there are found here small masses of soft creamy material, which is the natural secretion of the part. The canal of the urethra runs in the corpus spongiosum. Each of these three corpora is firmly united to the pubic bone behind. They are constructed of an outer sheath from the inner surface of which numerous fine membranous partitions stretch, dividing the whole up into numerous small compartments. These compartments are lined with a fine network of veins, which are able to expand with blood and to distend and fill up these spaces. When this occurs the whole organ swells and becomes firm and the tension of the fibrous material forming the main structure is called into play so that the process assumes the form of an erection. The veins which should drain the penis of blood are compressed by the action of certain muscles and this adds to the engorgement of the organ.