﻿166 The Philippine Journal of Science 1914 



name and 11 kilometers from Mangarin wharf. It has the 

 same general topography as Toong and the same conditions 

 favorable to the breeding of Myzomyia. Larvae were found, not 

 in abundance, but the spleen index of 44 per cent, higher than 

 that of Toong which is only 36 per cent, indicates that at certain 

 periods in the year mosquitoes are more abundant than at the 

 time of my visit. 



I have no hesitancy in asserting that not a single town, barrio, 

 or settlement in the whole region within easy traveling distance 

 by small boats of the San Jose estate is a desirable one from 

 which to draw laborers or from which to allow visitors to the 

 Mindoro plantation, on account of the great probability that 

 they will be malaria carriers and that a little relaxation on the 

 part of those charged with keeping the "living area" of San 

 Jose free from Myzomyia rossii will immediately result in these 

 laborers or visitors serving as a source of infection to employees 

 brought from other places in the Islands. That San Jose and its 

 immediate environment can be freed and kept free from mos- 

 quito infection is within the range of possibility, but only at the 

 cost of unceasing vigilance and an absolute cooperation between 

 the engineers in charge of the field operations and the sanitary 

 officer and his assistants. 



CONCLUSIONS 



The site for San Jose was ill chosen, as is admitted by all 

 concerned, but such an enormous outlay of money has been made 

 by the companies interested that the only alternative now left 

 them is the additional expenditures for keeping up preventive 

 measures already begun on a small scale. 



Eventual drainage of the area adjacent to the railroad for its 

 entire length will be necessary before this means of transporta- 

 tion can be freed from the present menace to the inhabitants 

 of San Jose. 



The surrounding towns and barrios must be permanently 

 isolated from communication with San Jose so long as mosquito- 

 breeding conditions in them remain as they are now and such 

 a large percentage of the population are carriers of the malaria 

 germ. 



Oiling and removal of algse from breeding places of Myzomyia 

 are at best a mere makeshift until drainage operations can be 

 instituted; but one or the other of these processes must be 

 constantly employed so long as fresh or salt water remains 

 stagnant or even semistagnant in the neighborhood of San Jose. 



My experience at San Jose in connection with the breeding 



