Rhases gives from preceding authors several descriptions of lithotomy, but as they closely resemble our author’s, we shall treat of them only in a cursory manner. In his first description he directs the surgeon to place the patient with his hands fastened to his ankles so as to press down the bladder. When the stone does not descend properly, so as to be felt externally, he recommends him to introduce one or more fingers into the rectum and push it outwards; and then while an assistant draws up the testicles the operator is to make a transverse (oblique?) incision, larger externally, but internally only of such a size as to allow the stone to pass out. If the stone does not come out readily it is to be extracted with an instrument, and the hemorrhage checked with a composition of aloes, frankincense, and vitriol. When the patient is a child he recommends the operator to place him upon the knees of an assistant, and to make pressure on the abdomen so as to force down the bladder. He forbids the operation when the stone cannot be brought down to the neck of the bladder. When the stone is large he directs it to be broken into pieces before extraction. His next description is taken from the celebrated Antyllus, but as it scarcely differs at all from the preceding one, we shall merely select a few remarks. When the stone is smooth, round, and small, he directs the surgeon to push it down to the neck of the bladder by means of a finger introduced into the rectum, and to make an incision down upon it; after which the stone is to be forced out. When pain supervenes after the operation, he recommends him to place the patient in a bath medicated with camomile, linseed, mallows, &c.; or if it be summer, and there be any disposition to hemorrhage, to place him in a vessel filled with strong vinegar. When it is ascertained that there are clots of blood in the bladder obstructing the urine, he directs the surgeon to introduce a finger by the incision, and extract them gradually. His next description is from an author named Sarad, whom he frequently quotes in other parts of his works. He directs the operator to introduce a finger into the rectum and push the stone outwards to the left side of the perineum, removed about the size of a grain of barley from the raphe (_daram_), and then to make an incision into the neck of the bladder. He afterwards gives a very circumstantial account of the operation from another author called Athuriscus. He particularly directs the operator to make an incision in the left side of the perineum and to open the neck of the bladder, as a wound of the body of the bladder seldom unites. When the stone is large he recommends him to seize it with strong pincers and break it into pieces. When a stone sticks in the urethra he directs him to tie one ligature behind it and to secure the prepuce before the glans with another, and then to cut down upon the stone. He gives very minute directions about the after treatment,