INTEREST. Tsetse fly and attempts to curb its effect in Africa.

Credits (40). General views of African scrubland south of the Sahara - cattle grazing (92). Herdsman with herd (108). Native men and children in village (142). Woman outside mud hut (164). Countryside showing bleached cattle skeletons (209). Tsetse fly close up (215). Map of Africa shows tsetse-ridden areas (263). White Red-Cross doctors treating large group of Africans suffering from sleeping sickness (284). Bullock suffering from 'nagana' (304). Microscope shot of blood of infected animal (314). More shots of cattle in countryside (347). Observations by early explorers lead to a number of scientists coming to Africa to study the fly - David Bruce and Charles Swinnerton at work in field (406). Nairobi street scene and East African Tsetse Reclamation Dept. (425). Dr. Lester, Head of Dept. (437). Tsetse country with field worker digging pupa out of ground (490). Grub develops into fully grown fly (622). Wild animals (660). Healthy cattle (675). Men catch tsetse in butterfly nets and make notes about numbers of fly in the area (713). Two scientists study the flies in the laboratory (790). Flies' saliva examined under microscope showing infections (811). Field patrol arrives at research centre with samples for Dr. Lewis, head researcher (855). Air-plane spraying insecticide (874). Smoke bomb being used on ground to clear small area of flies (894). Clearing land of vegetation (932). General view of cleared area (949). Swollen river erodes topsoil and the results of the erosion (998). Game being driven from infested area (1032). Laboratory in Manchester showing work in progress on the development of insecticide M7555 (antrecide), the drug to cure nagana. Microscopic views of before and after of infected mouse treated with M7555 (1282). Drug being manufactured in England and administered to the animals in Africa (1357). Cattle in infested areas (1404). Farming methods being taught to local farmers (1428). General shots of African countryside showing the improved farming methods in practice (1497). Herdsman (1509). Closing shots of countryside (1577). Credits (1582 ft).