Abstract
Although the<i>Trypanosoma evansi</i>, the cause of surra, was discovered by Evans in India as early as 1880, and the disease itself has been studied exhaustively by Lingard (1893-1896), relatively but little attention has been given to the parasite itself. Koch, while in German East Africa in 1898, described the disease prevailing in that region as surra, because he was of the belief that surra and nagana or the tsetsefly disease were identical. Bruce himself, in his work on the latter disease in 1894, inclined to the view of a possible identity of the trypanosome studied by him with that of Evans. Various other workers have held similar opinions, and even as late as last year Musgrave and Clegg<sup>1</sup>conclude that surra, nagana, mal de caderas, and probably dourine, are the same disease and that all are caused by<i>Tr. evansi</i>. The immunity experiments of Laveran and Mesnil<sup>2</sup>and those
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