420 JOURNAL, BOMBAY NATURAL HISTORY SOCIETY, Vol. XX. 



the neighbourhood of Frere Road it is doubtful if we should have 

 heard of much rnalaria in association with the New Docks. When 

 the Prince's and Victoria Docks were under construction there does 

 not appear to have been any marked occurrence of malaria in their 

 neighbourhood, neither does there appear to have been any great 

 increase along the line of the new Port Trust Railway, although 

 a considerable amount of excavation work went on there. At 

 Sewri too there is hardly any malaria even close to the new 

 reclamation. All these facts bear out the contention that tempo- 

 rary pools of water only become dangerous when permanent breed- 

 ing places of malaria carrying mosquitoes exist in their vicinity and 

 the problem of malaria prevention for Bombay becomes chiefly a 

 question of dealing with the permanent breeding places of N. step- 

 hensi. This can only be attained by controlling all permanent 

 collections of water and rendering them mosquito proof, either by 

 protecting them with some sort of cover or stocking them with 

 large numbers of one or other of the species of fish that I have 

 mentioned in this paper. Unfortunately we cannot depend upon 

 this sort of thing being carried out by voluntary effort and it rests 

 with the members of this Society in consort with all loyal citizens, 

 who have the welfare of Bombay at heart, to do their best in urging 

 upon the authorities the necessity for adopting a rational system 

 of malaria prevention for the City and ensuring by proper bye-laws 

 the necessary powers for putting it into operation. 



