But to return to the Wellcome Laboratory. Mr. Henry S. Wellcome is a rich Philadelphian, a member of the famous firm of Burroughs & Wellcome, manufacturing chemists and druggists of London. This firm makes a special study of tropical diseases and tropical medicines. A part of its business is outfitting missionaries and exploring parties. It furnished to Henry M. Stanley and others their medical supplies for travel throughout the world. It was probably through the study of such matters that Mr. Wellcome became interested in the Sudan and was induced to furnish, equip, and sustain this great laboratory. The objects of the institution are to promote the study of tropical disorders, especially those of man and beast peculiar to the Sudan, as well as to render assistance to the health officers and the civil and military hospitals. The laboratory experts are carrying on investigations regarding the poisons used by the natives and the chemical and bacteriological condition of the waters. They are also making studies of foodstuffs and sanitary improvements. They are testing and assaying the various minerals and are looking up all matters relating to the industrial development of the country. The main offices of the laboratory are in the college, but its explorers are sent out in every direction to make all sorts of researches. They are studying the mosquitoes of the country and are investigating the tsetse fly and other pests. Among other evils they are fighting the sleeping sickness, that horrible disease communicated by the tsetse fly which has killed its thousands throughout Central Africa. They are trying to rout the boll weevil and other insects which ruin the crops, and they are aiding the Cancer Research Fund and the Carnegie Institute in their inquiries. I have met a number of the scientists connected with this institution and I find them able men. They tell me that the Sudan has almost every noxious insect and pest known to man. It has worms and weevils which affect the cotton crop, and it has mosquitoes which carry malaria and which would carry yellow-fever if they were once inoculated by feeding upon a yellow-fever patient. Indeed, the stegomyia, or yellow-fever mosquito, swarms here, and if one of them should be impregnated with these disease germs it might start an endless chain of the scourge which could hardly be broken.