. Preventive medicine and hygiene. earth to the sun, and the surface becomes dry and hard, so that flies dieduring the pupal period. This measure has limited possibilities, but isuseful, as Shirata points out, around ports, in the neighborhood of vil-lages, wharves, and other places. The tsetse fly may also be fought by suppressing its food supply. Itmust obtain the blood of some vertebrate animal every two or three German Commission has shown that on the banks of the VictoriaNyanza the tsetse fly lives largely upon crocodile blood. This fact wasdiscovered by the interesting observati
. Preventive medicine and hygiene. earth to the sun, and the surface becomes dry and hard, so that flies dieduring the pupal period. This measure has limited possibilities, but isuseful, as Shirata points out, around ports, in the neighborhood of vil-lages, wharves, and other places. The tsetse fly may also be fought by suppressing its food supply. Itmust obtain the blood of some vertebrate animal every two or three German Commission has shown that on the banks of the VictoriaNyanza the tsetse fly lives largely upon crocodile blood. This fact wasdiscovered by the interesting observation that the flies frequently con- ^ Bull, of the Sleeping Sickness Bureau, No. 7, 1909. FLIES 259 tain parasites peculiar to the crocodiles blood. Koch believes that thedisease may be successfully controlled by destruction of the crocodiles,a theory which later research has rendered very unlikely. Todd and Wolbach ^ suggest a systematic examination of the nativesin the endemic area by gland palpation and gland puncture. The latter.
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Keywords: ., bookauthorwh, bookcentury1900, bookdecade1910, booksubjecthygiene
