. Protozoo?logy. Protozoa; Protozoa, Pathogenic. 264 THE PATHOGENIC FLAGELLATES lived in their blood as harmless guests, just as the trypanosome of the rat lives in the blood of that ;' In a very similar way the cause of human trypanosomiasis, Try- panosoma gambiense, was shown to be transmitted by another tsetse fly, Glossina palpalis (Fig. 103). Dutton, whose own life was the first to be martyred in the cause of sleeping sickness, gave the name to this trypanosome, which was first seen by Forde, in 1891, in the blood of victims of gambia fever. Castellani ('03), later, found tryp
. Protozoo?logy. Protozoa; Protozoa, Pathogenic. 264 THE PATHOGENIC FLAGELLATES lived in their blood as harmless guests, just as the trypanosome of the rat lives in the blood of that ;' In a very similar way the cause of human trypanosomiasis, Try- panosoma gambiense, was shown to be transmitted by another tsetse fly, Glossina palpalis (Fig. 103). Dutton, whose own life was the first to be martyred in the cause of sleeping sickness, gave the name to this trypanosome, which was first seen by Forde, in 1891, in the blood of victims of gambia fever. Castellani ('03), later, found trypanosomes in five cases of sleeping sickness in the cerebrospinal fluid, and in one of these cases, also, in the blood. This organism was regarded by Fig. 103. Glossina palpalis, Rob. X 3^^, Castellani as different from all others and named by him Tri/p. ugandense. Bruce, in the same year, confirmed these observations of Castellani, and also those of Dutton and Todd on gambia fever, and succeeded in demonstrating that the latter is only the first phase of sleeping sickness, and that the trypanosome is conveyed to man by only one agent, a species of tsetse fly. Confirmatory observations followed rapidly, English, German, French investigators risking their lives in scientific rivalry to get at the life history of this protozoan pest and its insect carrier. Tulloch's ^ Bruce, Tryj)anosomiasis, Osier's Modern Medicine, pp. 462 to Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Calkins, Gary N. (Gary Nathan), b. 1869. New York and Philadelphia, Lea & Febiger
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