ENTOMOLOGY

THE COXTROL OF HU:\lAN LICEor increased pressure, and in normal atmospheres or in vacuums (plateXXIII). Fulton and Stamford recommend the following procedurE!:1. Place woolen blankets or uniforms on hangers or loosely on traysin the sterilizer.!to Introduce 60 pounds steam into· the outer jacket to prevent subsequentcondensation within the sterilizing chamber.3. Create a 15 or ~O-inch vacuum to facilitate penetration of theclothing by the steam.4. Sterilize with steam.a. No pounds (atmospheric pressure) for one hour. •b. Twelve pounds steam for 10 minutes.PLATE XXII I.-Steam sterilizer in delousing station of U. S. Army Medical Corps.. The can-iage is transferred along the rails in the foreground to rails leading intothe other room where another carriage is seen. (Hutchison.)5. Produce 15 to ~O -inch vacuum to facilitate drying.6. Open the door of the sterilizer about 4 inches for 10 minutes toallow gradual cooling of the contents of the sterilizer.Steam under pressure will disintegrate woolens if the exposure is prolonged.The bacterial sterilization requires preliminary vacuum andloose packing. Garments placed in bags are likely to have the wrinklesset, if water of condensation settles in them when the steam has not penetratedat a sufficiently high temperature. If the cooling or drying is'\'Cry rapid, wrinkles and shl'inkage are quite likely to result.•