82 



situated for infection by Plasmodium -praecox were nevertheless found 

 in the majority of cases to be infected with P. vivax, the author doubts 

 whether these individuals are to be regarded as enjoying special 

 immunity. An explanation is required as to why P. praecox alone is 

 found in the tropical zone, why this form of the malarial parasite does 

 not exist in France, and why the two and sometimes the three forms of 

 malarial haematozoa are found in the sub-tropical zone. He suggests 

 that it must be admitted that the conditions of existence of the various 

 parasites in man are fixed by the chmate. The inexplicable 

 disappearance of P. praecox in France has been described from the 

 author's own observations. 



His investigations have led him to the conclusions that carriers of 

 P.falcipanitn recover spontaneously in France when they have regained 

 a good general state of health, and he is of opinion that tliis is 

 abundantly proved by long experience among the Colonial troops 

 infected in the tropical zone. He also considers that the varying 

 constitutions of the liquid environment of the j^arasite play an 

 important part in the cure of malaria. 



Leger (A.) & Certain ( — .). Recherche du Spirochete ict§ro- 

 h6morragique chez les Rats de Dakar. [Investigations regarding 

 the Ictero-haemorrhagic Spirochaete in the Rats of Dakar.] — Bull. 

 Soc. Path. Exot., Paris, xi, no. 1, 9th January 1918, pp. 19-22. 



In the course of the investigations recorded by the author, many rats 

 from the sewers and shipping port of the town of Dakar, Senegal, were 

 examined, including 67 individuals of Miis alexandrinus, 35 of Mus 

 rattus, and 18 of Mus decumanus. Inoculations from these rats always 

 produced negative results in guinea-pigs. In one individual of Mus 

 deciimanus a spirochaete was observed, identical in morphology and 

 pathological action with that recently described in a shrew under the 

 name Spirochaeta crocidurae [see this Review, Ser. B, v, p. 98]. This 

 is considered important on account of the great resemblance between 

 this spirochaete of sewer animals and those of human recurrent fever. 



In spite of numerous negative results, it is considered premature to 

 conclude that the spirochaete in question does not occur in the rats of 

 Dakar, especially as a malady diagnosed as acute jaundice, which in 

 some cases proved fatal, was recorded as an epidemic in 1916 among 

 soldiers from camps in the neighbourhood of Dakar. It is hoped to 

 complete this preliminary inquiry, which was made during the winter, 

 by further investigations during the coming season. 



Velu (H.). Les Affections du Cheval ^ Parasites endoglobulaires au 

 Maroc. [Equine Diseases produced by Endoglobular Parasites in 

 Morocco.] — Bull. Soc. Path. Exot., Pam, xi, no. 1, 9th Januarv 

 1918, pp. 26-27. 



The author points out that the malady clinically described as equine 

 piroplasmosis is in reality two distinct diseases, caused by entirely 

 different parasites, viz., Nuttallia equi and Pirop)lasma caballi. These 

 two diseases are difEerentiated by their symptoms. 



