48 L. Rogers — Special Report on Fever in Diuajpur Did. [Sapplfc. 



recommended (wliich proved eminently successful^ in getting rid of the 

 infection of coolie lines), he found that his hospital assistants and 

 menials in the Kala-azar camp one after the other contracted and died 

 of the disease. He then took to dosing them regularly with quinine, 

 after which, in the course of several years, he only lost one man, who 

 had become infected before the qu^inine administration. If it is such 

 a powerful prophylactic it can hardly fail to have curative effects in 

 big doses in early cases of the disease, so that the measures which will 

 be of value in preventing this class of fevers will be the wide distribu- 

 tion of quinine as in malarial fevers. 



Varieties and Distribution of Anopheles. 



The facts collected bearing on the presence of malarial -bearings 

 mosquitoes in different parts of tlie district may next be dealt with. 

 A careful study of this part of the question was first made in DinajpuF 

 town, and subsequently the varieties found in different circles in the 

 district were worked out. As Stephens, Christophers and James have 

 shown that the varieties of anopheles present in any district play a 

 very important part in the etiology of malaria, it is necessary to 

 ascertain the proportion of the different kinds as well as the total 

 number of the anopheles present. Thanks to the recently-published 

 book of the two first-named authors, this is not such a difficult task as 

 it was a short time back. In searching for anopheles it is necessary to 

 ascertain both their breeding places and also the numbers actually met 

 with in the houses of the people. The latter was done with the aid of 

 the Municipal Overseer, who rendered great assistance in the matter. 

 In the month of January, when this survey was carried aut, the breed- 

 ing places were limited to the rivers which run past and through the 

 town, and the tanks within it, which are not very many in number. 

 The former include a very sluggish weed-overgrown stream and a canal 

 of a similar nature, which run through the eastern part of the muni- 

 cipal area, while it is bounded on the west side by the river. There 

 are several good brick-lined drains in the town, but most of the roads 

 still have only earth surface ones, which always retain water and form 

 the most important breeding-ground for anopheles in the rainy season, 

 so that the distribution of the different varieties will be very much 

 more widespread at that time than they were at the time of my 

 inquiry. 



In all no less than five varieties of anopheles mosquitoes were 



1 Kala-azar snccessfully eradicated from tea gardens by segregation measures, 

 British Medical Journal, September, 1898, and Trans. Medical Ghir. Soc, 1899, 



