64 



The Philippine Journal of Science 



1916 



coccus, and pneumococcus. The fresh water in the tub (about 

 160 liters) showed 1,500,000 bacteria per cubic centimeter; after 

 one person bathed in it, the bacterial content was 5,300,000 ; and 

 after twenty persons used it, 2,086,600,000 bacteria per cubic 

 centimeter were found. In another tank of about 4,800 liters 

 the unused water had 700,000 bacteria per cubic centimeter; 

 after two hundred persons had bathed in the tank, the water 

 had 20,400,000 bacteria per cubic centimeter; after six hundred 

 persons had bathed in it, there were 683,000,000 bacteria 

 per cubic centimeter ; and after nine hundred persons had bathed 

 in it, there were 1,799,000,000 bacteria per cubic centimeter. 



A series of tests on the waters of certain swimming pools 

 in Germany gave the following results:* 



POOL A. 



Test No. 



Date. 



Bacteria 

 per cc. 



1 . 



Jan. 6, 1893 

 Jan. 18, 1893 

 Jan. 25, 1893 



9,700 

 50,000 

 75,000 



2- . _ . 



3 





The water of this pool was renewed each day and kept at a 

 temperature of 22°C. Samples for examination were taken from 

 the corner of the basin. In the center of the pool the bacterial 

 content was somewhat greater. 



Pool B had 400 cubic meters of water. It was refilled every 

 second day after being well cleaned and was kept at a temper- 

 ature of 20.6 °C. February 2, at 1 o'clock in the afternoon, the 

 water contained 53,500 bacteria per cubic centimeter, after 

 being in the pool for forty hours. February 8, the water con- 

 tained 22,000 bacteria per cubic centimeter, after being in the 

 pool for fifteen hours. 



Pool C contained 180 cubic meters of water. On March 9, 

 at 9 o'clock in the morning, the bacterial content of the pool was 

 23,000 per cubic centimeter; in the center it was 41,500 per 

 cubic centimeter. On March 16, at 6 o'clock in the afternoon, 

 the bacterial content in the corner of the pool was 6,800 per cubic 

 centimeter; in the center it was 14,000 per cubic centimeter. 



Bacteriological examinations of swimming pools in the United 

 States have been comparatively recent and few. Only in com- 

 paratively recent years have municipalities established and main- 



*Max Edel, Arch. f. Hyg. (1893), 19, 233. 



