444 



The Philippine Journal of Science 



SERIES I. FLOWING WELLS 



The results obtained from the flowing wells were so uniform 

 that it is not necessary to tabulate the results of all the 22 in 

 the series. In order to give an idea of the method employed 

 and the character of the results, the findings in two of them, the 

 one showing the highest degree of purity and the one showing 

 the lowest, are given in full. One well gave a slightly lower 

 degree of purity than the one chosen, but that well gave brackish 

 water and was little used for drinking ; so the next to the poorest 

 is tabulated. The well showing the highest degree of purity 

 was at Malolos, barrio Caingin. Rate of flow, 49 liters per 

 minute; temperature of water, 28°. 4 C; standing water near 

 well from overflow; no houses near. 



Table I. — Water from well in the barrio of Caingin, Malolos, Bulacan 



Province. 



\ 



■g 

 1 



Nutrient medium. 













Result. « 









20 hours at 36*^. 



40 hours at 36°. 



3 days at 36°. 



6 days, 3 at room 

 temperature. 



00 





si 

 11 



§'1 



1 



-6 





J 



T3 





1 





SI 



cc. 



1 



6 



1 

 5 

 1 

 5 

 5 

 5 



! 1 



1 



Glucose-broth fermentation 

 tube 





 

 

 

 

 

 

 









 

 

 

 

 

 

 





 

 

 

 

 

 

 









 

 

 

 

 

 

 



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» 





 









 

 

 

 



(") 





 



do 





do--. 



Plain a0£ir 



do 







Plain agar-plate culture 









" ' 





















■ Amoeba test negative. *> Growth on surface only. " One colony near mar^n. 



The well opposite the municipal building at Meycauayan gave 

 the lowest degree of purity. This water was slightly brackish, 

 and was reputed to have medicinal virtues. It is generally used 

 for drinking purposes. Rate of flow, about 5.7 liters per 

 minute; temperature, 29° C. 



