MISCELLANEOUS FORMULÆ. SEMMOLA’S MIXTURE. Sodium iodid, gr. xv; Sodium phosphate, gr. xxx; Sodium chlorid, gr. cx; Aqua, ℥xxxvj. A diuretic and laxative mixture. NORMAL SALT SOLUTION. Stock salt solution is kept for the purpose of making normal salt solution quickly and accurately. Use sodium chlorid (common salt) dried sufficiently to granulate. Stock Salt Solution by Weight. Sodium chlorid, ℥jss (47 gm.); Water, f℥viij (237 c.c.). Boil in a closed vessel fifteen minutes. When cold make up with sterile water to f℥j-viij. Strain through sterile cotton into a sterile bottle, and keep tightly corked. Normal salt solution should contain 90 grains of salt in 1 quart (1 L.) of water. Normal Salt Solution. Stock salt solution, f℥j (30 c.c.); Sterile water, Oij (1 L.). Salt Solution. Distilled water, Oiv; Purified salt, ℥xij. CARBOLIC ACID SOLUTION (5 PER CENT.). Cold sterile water, gal. j; Carbolic acid (95 per cent.), ℥iv. 1: 20 SOLUTION GLYCERIN FORMALDEHYD. Sterile glycerin, ℥viss (23 c.c.); Solution formaldehyd, Oj (500 c.c.). SOLUTION (1: 1000) OF BICHLORID OF MERCURY (CORROSIVE SUBLIMATE). Mercury bichlorid or corrosive sublimate, gr. xv (1 gm.); Common salt, gr. xv (1 gm.); Sterile water, Oij (1 L.). The salt in this formula is added to prevent decomposition of the mercurial salt by the albuminous juices of the tissues. ALKALINE SOLUTION OF CYANID OF MERCURY. Some surgeons recommend cyanid of mercury in solutions of 1: 1000 or 1: 2000 in place of the bichlorid of mercury. It is a powerful antiseptic that does not coagulate albumin, irritate the tissues, or attack metals. Mercury cyanid, gr. viiss (0.5 gm.); Sodium borate, gr. xv (1 gm.). These tablets are made to correspond to bichlorid tablets. Compressed tablets, each containing 7½ grains (0.48 gm.) of corrosive sublimate with tartaric acid, are also in common use. One of these added to 1 pint of water makes a solution of 1: 1000. SATURATED BORIC OR BORACIC-ACID SOLUTION. Boric acid crystals, ℥jss (47 gm.); Hot sterile water, Oij (1 L.). This solution may also be made by putting an excess of the crystals into the water, then sterilizing by boiling twenty minutes and straining through sterile cotton. SOLUTION OF POTASSIUM PERMANGANATE. This substance is used in a solution of royal blue or purple color, which should be freshly made. Place a few crystals in a piece of sterile gauze, and suspend in sterile water of the required quantity and temperature until the right color is obtained. IODIN SOLUTION.