EXPERIMENTS WITH HORSE-FLIES. 257 



XVII. 1901. Dr. Schilling. 



"Bericht iJBER DIE Surra-Krankheit der Pferde " 

 (Centralblatt fiir BaJderiologie, ParasitenJcunde und In- 

 feJctionskrankheiten. Erste Abteilung : Medicinish-hygie- 

 nische Bakteriologie und tierische Parasitenkunde. XXX. 

 Band. Ko. 15. Jena, .30 Oct. 1901, pp. 545-551). 



The author, who writes from Kleinpopo, Togo, gives 

 an account of a disease which is fatal to horses in the 

 Togo Protectorate, Slave Coast, W. Africa. He calls the 

 disease Surra, and describes the Trypanosome which 

 causes it. 



XVIII. 1901. A. TheUer. 



" Die Tsetse-Krankiieit " {Schveizer Archiv fur 

 ThierJieilkundfi, XLIII. Band, p. 97). 



XIX. 1901. L. Rogers, M.D. 



" The Transmission op the Trypanosoma Emnfii by 

 Horse Flies, and other Experiments pointing to 

 the Probable Identity op Surra of India and 

 Nagana or Tsetse-fly Disease of Africa (Pro- 

 ceedings of the Roijal Society of London, Vol. LXVITI., 

 pp. 163-170). 



" The close resemblance between Surra of India and 

 Tsetse-fly disease of Africa has long been known, while 

 Koch, after having seen the living Trypariosoma Evnnsi at 

 Muktesar in India, and soon after studied the parallel 

 disease in Grerman East Africa, pronounces them to be 

 the same, and in his ' Reiseberichte ' calls the disease 

 seen in the latter place ' Sunjakrankheit ' (p. 163). 



" In every case in which the flies had been kept from 

 one to four or more days after biting the infected animals, 

 no disease ensued in the healthy ones. Many such flies 

 were dissected and microscopically examined, but in no case 

 was anything which might be taken for a development of 

 the Trypanosoma in the tissues of the insect detected. . . . 

 When, however, flies which had just sucked infected 

 blood were immediately allowed to bite another healthy 

 animal, positive results were obtained after an incubation 

 period corresponding with that of the disease produced 

 when a minimal dose of infected blood is inoculated into 

 an animal of the same species. The result was uncertain 

 if only one or two flies were allowed to bite, and especially 



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