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MOTION PICTURES 77 bers on a model. (MN 2341-c; 21 min- utes) 41 Grow Your Own U.S. Department of Agriculture, 1945. Essentials of good gardening; site selec- tion, soil preparation, garden layout, planting, transplanting, cultivation, weed and pest control, and watering; stop- motion photography dream sequence on plant growth; humorous gardening "DON'TS." (20 minutes) 32, 41 Guadalajara U.S. Coordinator of Inter-American Af- fairs with cooperation of Mexican Tour- ist Bureau, 1943. Tourist view of the city. (17 minutes, color) 32, 41 Guardians of the Wild U.S. Department of Agriculture, 1943. Daily duties, ideals of public service and contributions of forest rangers in U.S. National Forests. Short version of "The Forest Ranger" also available. (11 min- utes) 3, 32, 41 Guarding Against Sabotage U.S. Department of the Army, 1943. Saboteur's techniques; psychological and physical sabotage; ideal precautions against sabotage in a defense plant. (TF 19-2032; 45 minutes) 41 Guerra ao Piolho U.S. Institute of Inter-American Affairs, 1947. Portuguese version of "Kill the Louse." Spanish version "El Tifo" also available. (8 minutes, color) 37 The Guided Bend Test U.S. Office of Education, 1944. (Welding Procedures Series. Testing No. 1) How to prepare groove weld and fillet weld test specimens for the guided bend test; make the test; and causes of failure in bending. Supplementary filmstrip, same title, also available. (OE 189; 17 min- utes) 32, 41 Guillotine Amputation of the Lower Extremity U.S. Department of the Navy, 1944. (Amputations Series No. 1) Two basic indications for amputations: irreparable interference with blood supply and mas- sive infection which cannot be controlled; how to select proper site of election before amputation. Special film for medi- cal personnel. (MN 3429-a; 12 minutes, color) 41 The Gyro Becomes a Compass U.S. Department of the Navy, 1944. (Gyro Compass Series) Why gyroscope, acting as compass, turns toward meri- dian; how motion is damped; kept on meridian; simplified models of pendulous and mercury ballistic type compasses. (MN 1792-d; 15 minutes) 7 The Gyroscope and Gravitation U.S. Department of the Navy, 1944. (The Gyro Compass Series) Theory and operation of pendulous and mercury ballistic type compasses; effect of grav- ity on gyroscope; operation of Arma Pendulous Compass and Sperry Mercury Ballistic Compass. (MN 1792-c; 12 min- utes) 7, 41 The Gyroscope and the Earth's Ro- tation U.S. Department of the Navy, 1944. (The Gyro Compass Series) How a sim- ple gyroscope becomes a gyro compass; principles of rigidity and precession and apparent rotation and gravity. Animated drawings. (MN 1792-b; 10 minutes) 7, 41 Habits and Characteristics of the Norway Rat U.S. Public Health Service, 1950. (Rodent Control Series No. 2) The Norway rat, parasite of man, its characteristics and habits: lives in colonies near garbage piles and city dumps, travels at night along established runways, can gnaw, climb, and burrow. (M 37-6; 28 min- utes) 27, 41