116 PA THOGENIC BACTERIA. present generally employed, and recommended by Welch and Hunter Robb, is as follows: The nails must be trimmed short and perfectly cleansed. The hands are washed thoroughly for ten minutes in water of as high a temperature as can comfortably be borne, soap and a brush previously sterilized being freely used, and afterward the excess of soap washed off in clean hot water. The hands are then immersed for from one to two minutes in a warm saturated solution of permanganate of potassium, then in a warm • saturated solution of oxalic acid, until complete decolorization of the permanganate occurs, after which they are washed free from the acid in clean warm water or salt-solution. Finally, they are soaked for two minutes in a i : 500 solution of bichlorid of mercury, after which they are ready for use. Lockwood,1 of St. Bartholomew's Hospital, recommends after the use of the scissors and penknife, scrubbing the hands and arms for three minutes in hot water and soap to remove all grease and dirt. The scrubbing brush ought to be steamed or boiled before use, and kept in i : 1000 biniodid of mercury solution. When the soap- suds have been thoroughly washed away with plenty of clean water, the hands and arms are thoroughly washed and soaked for not less than two minutes in a solution of biniodid of mercury in methylated spirit; i part of the biniodid in 500 of the spirit. Hands that cannot bear i : 1000 bichlorid and 5 per cent, carbolic solutions, bear frequent treatment with the biniodid. After the spirit and biniodid have been used for not less than two min- utes, the solution is washed off in i : 2000 or i : 4000 biniodid of mercury solution. Catgut cannot be sterilized by boiling without deterio- ration. The present method of preparing it is to dry it in a hot-air chamber and then boil it in cumol, which is afterward evaporated and the skeins preserved in sterile test-tubes or special receptacles plugged with sterile cot- ton. Cumol was first introduced for this purpose by 1 Brit. Med. Jour., July II, 1896.