1900 ] and the distribution of Anopheles Mosquitos. 471 



for five miles as far as tbe Bhagar Kbal, and although narrow to the 

 south it gradually widens out to the north, so that while the lower 

 three Wards are mainly inhabited near the banks of the river, the 

 majority of the people in tbe two northern Wards live at some little 

 distance from tbe river at Halishahar and Kanchrapara. Moreover, the 

 Gauripur Jute Mills supply some filtered water to WardsII., so it is 

 worthy of note that this Ward again has the lowest spleen-rate, namely, 

 10*8, which is little more than half that of the Wards I. and III. on 

 either side of it, which are dependant on tbe river for their supply. 

 Further, Wards IV. and V. have the highest rates of all, being mainly 

 dependant on tank water for their supplies, so that, and that, in spite 

 of their ground water-level being lower than that of Ward III. ; so 

 that the only way in which these variations can be explained is by 

 the differences in the water-supplies of the various Wards, which are 

 also in accordance with the results obtained in every previously consi- 

 dered instance. 



TABLE XIV. 



Naihati. 



Ground Corrected 



Ward. Water- Level. Water-supply. Spleen percentages 



Feb., Kains, Adult Children. General 



1900. 1899. Males. Total 



1(36) ... ... Mainly River. 166 225 J9.5 



II. (37) ... ... Partly filtered. 6'6 15'0 10'8 



111.(38) 7 ft. 9 in ... Mainly River. 71 310 19*0 



16 ft. 6 in. 8 ft. 

 IV. (39) 10ft. 3 in. 4 ft. Mainly Tank. 153 29*4 223 

 V. (40) JO ft. 3 in. 4 ft. Tank. J 3*3 42-5 27-9 



Baraset.— This Municipality is situated on the Soonthee Nudi some 

 eight miles east of the Hooghly river, and its surface drainage flows 

 away to the south-east into the Kocho Bhil. The Soonthee was 

 formerly a large river, but now it resembles an elongated swamp with 

 little or no current except during the rainy season, while its bed is 

 encroached upon in numerous places by series of tanks which in places 

 leave but a few yards between them for the stream, and fishing weirs 

 etc., also obstruct its course. The Municipality is divided into five 

 Wards, Nos. I. and II. including the town, while Nos. IV. and V. are to 

 the east on the Soonthee Khal, and No. III. to the south. In all the 

 spleen-rates are high, and the ground water-levels do not vary much, 

 but are high in the rains, showing obstructed drainage and water-loggino-. 

 The water-supply is from tanks, although one or two tube wells° have 

 been put down 



