462 L.Rogers — Relationship of the water-supply, water-logging [No. 4, 



will take chiefly river water in the western Wards, and tank water in 

 the eastern ones. The water-level in three wells varried only between 

 4 and 5 feet from the surface in February, and in the rainy season it 

 had been within from 1 to 2 feet of it ; so that here again there was 

 considerable water-logging but the minimum amount of fever, while 

 although the western portion is more densely populated, the eastern 

 part presents numerous tanks, and is generally favourable to the deve- 

 lopement of malaria, yet, apparently owing to the filtered water-supply, 

 the spleen-rate is very low. 



TABLE III. 



Chitpore-Cossipore . 



Ground Corrected 



Area. Water-Level. Water-supply. Spleen percentages. 



Feb., Rains, Adnlt Children. General 



1900. 1899. Males. Total. 



Chitpore, West (3) 4 ft. 3 in. X ft. Filtered. 2 05 7-7 485 



Cossipore, West (4) 4 ft. 9 in. 2 ft. 9 in. do. 106 9"3 9*95 



Chitpore, East (5) 5 ft. 1 in. 2 ft. do. 160 10 13-00 



Cossipore, East (6) do. 183 152 1675 



South Dum Dum. — To the east of the railway, which bounds the 

 Chitpore-Cossipore Municipality, lies South Dum Dum, the most thickly 

 inhabited portions of which are situated on the Jessore, Belgatia and 

 Dum Dum roads, and it is divided into three Wards, which may roughly 

 be taken as respectively including the parts adjoining these three ronds. 

 The inhabitants of Ward II who were examined mostly resided near the 

 easternmost portion of the Dum Dum road, and the spleen rate was 37*9. 

 Those of Ward I. mostly lived around that portion of the Jessore road 

 which joins the eastern ends of the Belgachia and Dum Dum roads, 

 and its spleen-rate was 45*3. Lastly, most of those examined in Ward 

 III. lived around the western end of the Belgachia road just to the east 

 of the railway, and consequently close to the Western Ward of Cossipore, 

 and the spleen-rate among them was only 13*7, by far the lowest rate 

 of any place to the east of the railway. Here again the probable 

 explanation of this exception is that many of the inhabitants of this 

 Ward obtain filtered water from the Cossipore Municipality as I ascer- 

 tained both by inquiry and by seeing them carrying the water myself, 

 while the portion of the other Wards which were examined were too 

 far from Cossipore for the people to resort there for water to any 

 extent. The conditions favourable to malaria are very similar in each 

 Ward, for the Bajulla Khal flows right through Wards II. and III. as a 

 broad swampy track with little or no current except during the rainy 

 season, while the tide flows up it from the Salt Water Lakes at high water, 



