71 



nemoralis, Mg., as well as the species mentioned, employed 

 laboratory animals and do not ap})car to have made actual 

 experiments upon camels. According to the authoi-s in question, 

 however, the natives of North Africa always assert that the disease 

 is transmitted by Tabanida?, and camel-drivers declare that the 

 two species used by the French scientists, which are apparently far 

 more common in Algeria than any others, are especially dangerous 

 to camels. The disease, which is almost invariably fatal, commits 

 great havoc among animals that have passed the summer in a 

 locality where Tabanids are numerous, but among others that have 

 been kept in a place where the flies are nearly absent its incidence 

 is slight.* In a subsequent paperf the same authors proceed to 

 the consideration of other trypanosomiases of domestic animals in 

 Algeria, and, after giving in tabular form the results of their 

 experiments with Tabanidse as transmitters, write as follows| : — 

 " The perusal of this table shows that the Tabanids that are most 

 common in Algeria are able to transmit nagana, mat de la Zousfana 

 [a trypanosomiasis of horses], and dourine by biting a healthy 

 animal immediately after having bitten an animal having a great 

 many Trypanosomes in its blood. A single bite is sometimes 

 sufficient to cause inoculation {Tabanus sp. and nagana, 2 cases). 

 We saw the same thing in 1904, in the case of debab. We were not 

 able to reproduce in 1905, with the three viruses employed, the 

 successful result obtained in 1904 with debab, i.e., the communication 

 of infection to a healthy animal by Tabanids which had sucked 

 infected blood about twenty-four hours previously." 



In the French Sudan, according to Laveran,§ who quotes L. 



* Cf. Drs. Edmond and Etienne Sergent. " El-Debab.— Trypanosomiase des 

 dromadaires de I'Afriquo du Nord " : Annales de I'lnstitut Pasteur, T. XIX., 

 pp. 17-48 (1905). 



t Cf. Drs. Edmond and Etienne Sergent, " Etudes sur les Trypanosomiases de 

 Berberie en 1905 " : ibid., T. XX., pp. 6G5-681 (1906). 



J Loc. cit., p. 680. 



§ Cf. A. Laveran, Comptes Rendus des Si'ances de VAcadrinie des Sciences, 

 T CXXXIX., p. 661 (1904).— Since Laveran's paper, it lia.s been sliown experi- 

 mentally by Dr. Bouffard that a species of Stomoxys is capable of conveymg 

 Trypanosoma cazalboui, Laveran, tlio parasite of soiima. 



