292 U. S. GOVERN

Function of typical paint-spraying outfit: spray gun; material containers; hose; air transformer; condenser; compressor. (107; 60 frames) Spray-Time U.S. Public Health Service, 1945. Several methods of malaria mosquito eradication w emphasis on residual spraying with DDT. Stresses family cooperation with spray program for successful home spraying. Photographs. (CDC-5-028; 83 frames, synchronized disc, 13 minutes) Spread and Prevention of Trichinosis U.S. Department of the Army, 1948. Causes, effects and spread of trichinosis; precautionary measures from pigsty to dinner table to prevent and eradicate the disease. Spread and Prevention of Trichinosis U.S. Public Health Service, 1948. L cycle of T. spiralis; prevalence a spread of trichinosis; symptoms of disease; control measures; and, consumer preventive measures. Photographs, drawings and photomicrographs. (CDC- 5-090; 67 frames, synchronized disc, 12 minutes) The Square Knot U.S. Coast Guard, 1941. Reviews material prevented in motion picture, same title. (26 frames)