72 



The Philippine Journal of Science 



1016 



Similar tests were made on untreated water from the reser- 

 voir, and on the chlorinated tap water as drawn at the labor- 

 atory, which probably corresponded to the water used in the 

 swimming pools. The results appear in Table C. 



Table C. — Protozoa found in water. 



[A, amoebae ; C, ciliates ; F, flagellates.] 



Date. 



Pool- 



Reser- 

 voir. 



Tap. 



I. 



II. 



III. 



1915. 

 Aug. 30 - 



F 



AF 

 A 

 A 

 F 

 F 

 F 

 Negative 

 F 

 A 

 AC 

 F 



F 



C 

 AF 



A 



C 



A 



F 



Negative 



AC 



AC 



A 

 AP 



F 

 A 

 AC 

 A 

 A 



F 



F 

 Negative 



F 

 Negative 



A 

 Negative 

 Negative 

 Negative 



F 

 Negative 



AF 



ACF 

 AF 



A 



A 

 AF 

 AP 

 AF 



C 

 Negative 



F 



F 



F 



Aug. 81- 



Sept.l.. 



Sept. 2 



Sept. 3 -._ 



Sept. 4 _. 



Sept. 6 





Sept. 7 





Sept. 8 





Sept. 9 





Sept. 10 





Sept. 11 









These findings seemed to indicate that the swimming-pool 

 waters were no more contaminated with protozoa than the city 

 water supply. As there is not sufficient evidence to show that 

 these are any but harmless organisms, the determinations along 

 this line were discontinued. 



In order to ascertain the extent of pollution of the pool, tests 

 for Bacillus coli were made for eleven weeks both of the pool 

 waters and of the supply water obtained at the laboratory tap. 

 One cubic centimeter of the water to be tested was inoculated 

 into a fermentation tube. The results of these experiments 

 showed that B. coli was only slightly more abundant in these 

 swimming pools than in the city water supply. 



Previous to this investigation disinfectants were regularly 

 used twice a week in these tanks. It was found that at the 

 different pools different strengths of disinfectant were being 

 used and applied in different ways. It was desirable to secure 

 the application of the same disinfectant to the three pools in 

 more definite amounts as well as to make chemical tests on the 

 water as the work proceeded. Mr. George W. Heise, chemist, 

 Bureau of Science, cooperated and made all the chemical tests " 



''This Journal, Sec. A (1916), 11, 105. 



