British Contributions To Tropical Health -- Every year expeditions go from Liverpool to posts in many areas of the tropics, bringing back with them creatures which carry diseases, so that these may be studied with all the facilities available in the home laboratories. Professor R. M. Gordon (left) in March 1951 visited the Anglo-Egyptian Sudan, where he worked on diseases such as bilharzia, prevalent in the area. On his return he brought various carriers of disease, including the larvae of sand flies, one of which he is here removing from its cage for examination. The sandfly is the carrier of Kala-azar and tropical sore to man. With him (right) is Dr. O'Rourke, who is leaving shortly to take up a post as research officer to the Canadian Government in the northern lumbering areas, where flies are a great nuisance to workers. May 1, 1951. (Photo by Central Office Of Information Photograph).