1900.] and the distribution of Anopheles Mosquitos. 459 



to be suffering from enlarged spleen in each Municipality. They are 

 arranged in order from above downwards as they are situated on the 

 map from north to south, while the westernly ones, which lie on the 

 east bank of the Hooghly, are placed on the left, and the easternly ones, 

 which are at a little distance from the river, are placed in the right-hand 

 column, so that the table roughly represents their position on the map. 



TABLE I. 



Municipality. 



Spleen 

 percentages 



Municipality. 



Spleen 

 percentages. 



Naihati ... 



... 



19-9 



(Gobardanga) ... 





(55-5) 



Bhatpara 





20-0 









Garulia ... 



... 



33-8 







r 



North Barrackpore 





36 5 



(Busirhat) 



... 



(52-8) 



Titagarh 





37-8 



Baraset 





529 



South Barrackpore (West) 



25-2 



South Barrackpore 



(East) 



56-0 



Kamarhati (West) 



• •• 



18-8 



Kamarhati (East) 





34-8 



Baranagar 



... 



17-8 



North Dum Dum 



... 



68-1 



Chitpore-Cossipore 



... 



11-2 



South Dum Dum 



... 



32-3 









Maniktolla 



... 



13-2 



Average 



... 



24-5 



Average 





41-0 



A glance at the above table or at the shaded map will show that 

 the places situated on the bank of the Hooghly river have a much 

 lower spleen percentage than those further to the east, even when the 

 latter are but two miles from the river as in the case of the last five 

 in the right-hand column of the table, with the exception of part of 

 North Dum Dum. This having been ascertained, the question arose 

 whether the lower rate on the banks of the Hooghly was to be regarded 

 as the normal rate, and the higher figures of the inner tract as being 

 due to water-logging or other abnormal conditions, or whether the latter 

 must be taken as the usual state of affairs in this part of Lower Bengal, 

 and the banks of the Hooghly as being exceptionally healthy. In order 

 to solve this problem it was necessary to visit other places still further 

 to the east, and Gobardanga and Basithat, which are situated on the 

 next flowing river to the east of the Hooghly, namely, the Ichahamati, 

 were selected as the most suitable for the purpose. The former is some 

 20 miles to the east of Naihati, while the latter is 26 miles to the east 

 of Baraset. The former is nearly surrounded by a bend of the river 

 on two sides and by marsh land on the other sides, so that cannot be 

 considered to be well situated from the health point of view, but 

 Basirhat, on the other hand, would appear to be likely to be as healthy 

 as any place in this portion of the Gangetic delta. Nevertheless, both 

 show a spleen-rate of over 50 per cent., which, agreeing as it does with 

 Dr. Gregg's statements about this tract of country, may be taken as 



