A catheter is first passed into the bladder, and the urine runs off. The catheter is then gently withdrawn, till the stream ceases, that the end of the instrument may remain just without the neck of the bladder. The string should be tied round the catheter ½ an inch from the meatus, its ends gathered together and tied in a knot about 1 inch farther on. The foreskin is then drawn back, the ends passed beneath the glans and tied round the penis behind the corona; the superfluous string is snipped off, and the foreskin brought forward. The catheter is cut off obliquely ½ an inch beyond the string and then stopped with a spigot, direction being given to the patient to withdraw the spigot, and push the catheter a little further in when he wants to make water. =To Tie a Patient in Position for Lithotomy.= _Apparatus._ Two bandages, each 3 yards long and 2 inches wide, of calico or saddle-girth, with tapes sewed on the ends. [Illustration: Fig. 92.—Tying for lithotomy.] The patient is laid on his back, a slip-knot made in the middle of the bandage and passed over the wrist; the hand is then made to grasp the foot, the thumb above, the fingers under the sole (fig. 92); one end of the bandage is carried behind and inside the ankle to the dorsum of the foot, where it meets the other end passing in front of the ankle. The ends are then carried under the sole, brought up and tied in a double bow over the back of the hand. =Bedsores= are best treated by great cleanliness, and by washing the skin exposed to the discharges with spirit of wine every day. Brown-Sequard recommends cold and heat to be applied daily, by means of an ice bag for ten minutes, followed by a warm poultice for an hour. The pressure of the skin over the sacrum or trochanters is prevented by a ring of soft thick felt, covered on one side with adhesive plaster, and applied like a corn plaster _around_ the prominent bone. In addition to these local applications, the pressure of the body should be evenly distributed over its under surface by placing the patient on a water cushion, or, better, on Arnott’s water-bed. [Illustration: Fig. 93.—Water-bed.]