Thymi are fleshy excrescences, forming sometimes upon the glans, and sometimes upon the prepuce; and some of them are malignant, and some are not. Those which are of a mild nature it will be proper to pare away with the edge of a scalpel, and sprinkle the part with chalcitis; but when malignant, the part must be burned after they are removed. If there be thymi on both sides of the prepuce, some internal and others external, we must not attempt all at the same time, lest by mistake we should cut off the prepuce, which is thin; but we must first cut off the internal, and, when they are healed, we may next attempt the external. Some of the moderns effect a cure by cutting them off with a pair of scissors, and by binding them with a horse-hair; as, in like manner, some burn them with the cold cautery. * * * * * COMMENTARY. Albucasis copies our author’s description. (Chirurg. ii, 56.) When the tumour is of a malignant nature, he particularly approves of using the actual cautery. These intractable tumours on the genital member are now frequently met with. SECT. LIX.—ON CATHETERISM, AND INJECTION OF THE BLADDER. When the urine is suppressed in the bladder, owing to some obstruction, such as a coagulum, or stones, or from any other cause, we have recourse to catheterism for the removal of it. Wherefore, taking a catheter proportionate to the age and sex we prepare the instrument for use. The mode of preparation is this: having bound a little wool round with a thread, and introduced the thread with a sharp rush into the pipe of the catheter, we adapt the wool to the opening at the head of the catheter, and having cut off the projecting parts of the wool with a pair of scissors, we put the catheter into oil. Having then placed the patient on a convenient seat, and used fomentations, if nothing prohibit, we take the catheter and introduce it at first direct down to the base of the penis, then we must draw the privy parts upwards to the umbilicus, (for at this place there is a curvature of the passage,) and thus push the instrument forwards. When in the perineum it approaches the anus, we must bend the member with the instrument in it down to its natural position, for from the perineum to the bladder the passage is upwards; and we must push the instrument forwards until it reach the cavity of the bladder. We afterwards take out the thread fastened into the opening of the catheter, in order that the urine being attracted by the wool may follow, as happens in syphons. Such is the method of introducing the catheter. But since we have often occasion to wash an ulcerated bladder, if an ear-syringe be sufficient to throw in the injection it may be used, and is to be introduced in the manner described above. But if we cannot succeed with it we may fix a skin or the bladder of an ox to the catheter, and throw in the injection through its opening. * * * * *