2. In a German medical journal, published at Leipsic, Gerson corroborates his former assertions as to the efficacy of disinfection of instruments with tincture of soap, citing extensive bacteriologic tests in evidence. He wraps the blades in Brun’s cotton, impregnated with tincture of soap. The cotton protects them from the air and the tincture is an efficient disinfectant. The instruments are then ready for use at any moment. After using them he rubs them clean with cotton moistened with the same tincture, then wraps them in a fresh piece and lays them aside. No boiling or steaming is required, and the instruments are not harmed by the process. He recommends this method especially for military and other practice where steam disinfecting appliances are not available. He has found that instruments infected with pus, etc., and not even wiped off after having been used, proved perfectly sterile after a few days in the wet cotton wrapper. No colonies developed when they were rubbed on agar plates or soaked in bouillon. _To Arrange Instruments for the Convenience of the Operator._—Instruments for immediate use are laid in trays on a small movable table on the operator’s right hand. Instruments that may not be needed are kept in another tray. A separate tray is used for suturing material, needles, a pair of sharp-pointed scissors, and long forceps. Before placing instruments in the tray, dry with sterile towels. TO CLEAN INSTRUMENTS. _First of all_, the knives, scissors, and needles should be laid carefully aside and cleaned at once. Scrub all instruments in cold water to remove blood and pus, then in hot water with plenty of soap. Rinse thoroughly in hot water, then place in boiling water, take them out singly and dry; _do not drain_. Following pus cases all instruments must be boiled for at least fifteen minutes in 1 per cent. soda solution. TO STERILIZE GLOVES. Examine carefully to see that they are in perfect condition. Select a pair, then wrap each one in a separate piece of gauze, fasten together, and boil at least 15 minutes in salt solution. TO DRY STERILE GLOVES. Cover a table with a sterile sheet. Prepare hands and person as for an operation, and draw on a pair of sterile gloves. Then dry gloves with sterile towel, and powder them inside with sterile powdered talcum. TO CLEAN GLOVES. Soak in cold water, then wash with green soap and hot water. Rinse and dry. If used in pus cases, boil 15 minutes before laying away. TO STERILIZE SILK-WORM GUT OR SILK THREAD. Boil in sterile water 20 minutes and preserve in alcohol, 95 per cent., or first sterilize in steam sterilizer for 20 minutes, then boil in sterile water for 20 minutes and preserve in alcohol, 95 per cent. TO STERILIZE HORSE-HAIR. 1. Wash thoroughly in green soap and water. Rinse several times. Soak in ether 24 hours. Boil in sterile water 20 minutes. Preserve in alcohol, 95 per cent.