926 EXPERIMENT STATION RECORD. 



been called Miliary fever or gall sickness, the author discovered an organism which 

 has hci'n given the name Trjfjinnosoma theileri. This organism can l)e quickly 

 demonstrated by examining fresh ))lood of affected animals. Two forms of the para- 

 site are observed, in one of which the centrosome lies at the posterior end, while in 

 the other it is in the nucleus. Notes are given on the methods of rejjroduction of 

 this organism, on involution forms, and agglutinati<m. The jihenomenon of agglu- 

 tination is rarely observed in the case of T. tJu'llerl. Inoculation experiments were 

 made on horses, 'logs, sheep, goats, rabbits, guinea pigs, rats, and mice. All these 

 experiments gave negative results, and it is tiierefore concluded that the organism 

 affects only ciittle. T. theileri was found in species of Ilippobosca, which were later 

 identified as //. rafipes and //. maculatu. These Hies are believed to be the natural 

 means of transmitting the disease. Detailed notes are given on the symptoms and 

 pathological anatomy of this disease. In the author's experience about 58 per cent 

 of cattle were susceptible. Susceptibility was observed in cattle of all ages; the rate 

 of mortality was 12.5 per cent, period of incubation from 4 to 6 days. Many cattle 

 are naturally immune, and thi.« is attributed to previous infection with the blood 

 parasite. 



The existence of a piroplasmosis in horses in Madagascar, Thiroux {Compt. 

 Rend. Soc. Biol. Paris, 55 (1903), No. 39, pp. 1188, 1189).—l'iroplasma equi is briefly 

 described, and notes are given on its distribution with special reference to it« occur- 

 rence in horses in Madagascar. 



The development of the parasite of the tsetse-fly disease in mammals, E. 

 M.'VRTiNi {Ztschr. Hyg. u. Tnfectiomkraiik., 4- (190.)), Xn. .^, pp. 341-S-50, pi. 1, Jigs. 

 10). — The author made a study of the various forms in which this organism occurs 

 in mammals, especially in dogs. The morphology of these forms is described in 

 detail. It was found that the organisms were present in considerable numbers in 

 specimens of Slomo.v.ys calcitrans which had been allowed to suck the blood of 

 infected mammals. The Trypanosoma was found in the alimentary tract of these 

 flies for a period of 23 hours. No division stages were observed in the blood para- 

 site, however, and the parasites appeared ultimately to be digested in the alimentary 

 tract of the flies. Experiments instituted for the purpose of testing the possibility 

 of transmission of the disease by such infected flies which were allowed to suck the 

 blood of dogs gave negative results in all cases. 



Hemoglobinemia in horses, C. Roche (Jour. Med. Yi't. et Zootech., 5. ser., 7 

 {1903), July, pp. 414-4I6). — In the author's experience this disease is comparatively 

 rare. During the month of June, however, of the past year 25 cases were observed, 

 and notes are given on the symptoms, etiology, and treatment. The author believes 

 that the numerous sudden changes of temperature which occurred were partly 

 responsible for the unusual prevalence of this disease. Nearly all cases responded 

 favorably to hydrotherapy. 



Equine malaria and its sequelae, A. Theiler {.four. Compi. Path, and Ther., 16 

 {1903), No. 2, pp. 97-120). — Malaria of horses in South Africa is said to be due to 

 infection with Pyroplasma equi. Notes are given on tlie appearance of this organism 

 and on inoculation experiments to determine the causal relation of the organism to 

 the disease. Apparently 1 attack of equine malaria confers a certain amount of 

 immunity, but experimental evidence of this proposition was not obtained by the 

 author. The sequekv of the tlisease are frequently of a serious character. The 

 author concludes from his study that while P. equi is the primary cause of equine 

 malaria, this organism predisposes to a symbiotic and secondary infection with a 

 specific bacillus. The secondary infectio^i may take place after complete recovery 

 from the primary malaria. 



South African horse sickness, E. C. Webb {Jour. Comp. Path, and Ther., 16 

 {1903), No. 2, pp. 120-127). — The pathological anatomy of this disease is described 

 on the basis of 48 post-mortem examinations. The symptoms and lesions are pre- 

 sented in tabular form according to the peculiar features of the different cases. As a 



