XI, B, 2 



Gabel: Examinations of Swimming Pools 



75 



Table III. — One part per million of available chlorine as calcium hypo- 

 chlorite, added weekly to water in swimming pools, week of September 

 27 to October 2, 1915. 



[Bacteria per cubic centimeter of water.] 





Sept. 27. 



Sept. 28. 



Sept. 29. 



Sept. 30. 



Oct. 1. 



Oct. 2. 



Pool I: 



Agar, 25° C 



900 

 800 



30 

 60 



18,000 

 25,000 



42,000 

 200, 000 



120.000 

 570,000 



200, 000 

 180,000 



Agar. 37° C 



Average - - - 



850 



45 



21, 500 



121, 000 



345,000 



190,000 



Pool II: 



Agar, 25° C 



52,000 

 57,000 



110 

 200 



17,000 

 19.000 



14,000 

 76,000 



22,000 

 68,000 



90.000 

 140,000 



Agar, 37° C - - 





54,500 



155 



18,000 



45,000 



45,000 



115, 000 



Pool III: 



A(rar, 26°C 





5,000 

 7,000 



190, 000 

 320, 000 



64,000 

 150,000 



500,000 

 630,000 



170,000 

 160, 000 



Agar, 37" C 





Average . 







6,000 



255,000 



107, 000 



565,000 



165,000 











Table IV. — Two parts per million of available chlorine as calcium hypo- 

 chlorite, added weekly to water in swimming pools, week of October U 

 to 9, 1915. 



[Bacteria per cubic centimeter of water.] 





Oct. 4. 



Oct. 5. 



Oct. 6. 



Oct. 7. 



Oct. 8. 



Oct. 9. 



Pool I: 



Agar, 25° C 



4,000 



3.000 



70 

 1.000 



2 



10 



11,000 

 12,000 



1,300,000 

 2,400,000 



150,000 

 200, 000 



Agar, 37° C. 



Average 





3,500 



550 



6 



11, 500 



l.S.SO.OOO 



175.000 



Pool II: 



Agar, 25° C 





1,000 

 2,000 



100 



400 



22,000 

 27,000 



20, 000 

 30, 000 



40,000 

 630, 000 



200,000 

 240, OCO 



Agar, 37° C 







1, 500 250 



24, 500 



25, 000 



335, 000 



220, 000 



1 Pool III: 



Agar, 25° C 



6,000 

 19. 000 



70 

 210 



4 

 10 



65, 000 

 45. 000 



1, 200, 000 

 1, 270, 000 



6,000 

 7,000 



Agar, 37° C— 



Average 



12, 500 



140 



7 



50,000 



1,235.000 



6,500 





