Strapping has this advantage over a bandage—its circular strips do not pass round the chest completely and thereby hamper the breathing as the roller does. =To strap the Testicle.= _Apparatus._—1. Strips of soap plaster spread on calico, or better, on wash-leather, ½ inch wide and 12 inches long. 2. A can of boiling water. 3. Razor and soap. [Illustration: Fig. 20.—Strapping the Testis.] First, shave the scrotum; then tighten the skin over the testis with the left thumb and forefinger passed above it; take a strip of plaster 6 inches long and ½ inch wide, and encircle the cord tightly with it; next pass another strap of the same width, 9 or 10 inches long, from the back of this ring, over the testicle to the front, drawing it tight also (see fig. 20). The strapping is continued by laying fresh straps over each other until the whole testis is covered in. Lastly, take a strip 15 or 20 inches long, and, beginning at the ring above, wind it round and round the testicle until all the vertical strips are confined in place by this spiral strip. The strapping should be re-applied the second or third day, as the testicle by that time will have shrunk within its case. [Illustration: Fig. 21.—Strapping an Ulcer.] [Illustration: Fig. 22.—Strapping the Ankle.] =Strapping Ulcers and Joints.=—Cut strips of plaster one-third longer than the circumference of the part to be strapped; if that is irregular, as the ankle or wrist, they must be narrow: commonly the width varies between ¾ inch and 1½ inch. The strips are warmed, the middle passed behind the limb, the ends crossed in front (see fig. 21) and drawn tight, but with sufficient obliquity for the margins of the strip to lie evenly. The strapping is begun as low down the limb as requisite, and continued upwards by laying on more strips, each overlapping about two-thirds of the preceding strap. When the process is finished, the ends should meet along the same line, and all the uppermost ones be on the same side. _The ankle_ is strapped differently. Strips are prepared about ¾ inch wide; one is carried behind the heel and its ends brought forward till they meet on the dorsum of the foot; a second, encircling the foot at the toes, secures the first; a third is again carried behind the heel above the first, and is fixed by a fourth round the foot. This is continued until the foot and ankle are firmly supported (see fig 22). =Strapping a Joint with Mercurial Ointment.= (_Scott’s Bandage._) _Apparatus._—1. Mercurial ointment. 2. Diachylon plaster. 3. Lint. 4. Spirit of camphor. 5. Cotton wool. 6. Freshly scalded starch, or solution of gum. 7. Binder’s millboard.