78 



The Philippine Journal of Science 



1916 



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

 chlorite, added daily to pool III. One-seventh part per million of 

 available chlorine as antiformin, added daily to pool I. Week of 

 November 15 to 20, 1915. 



[Bacteria per cubic centimeter of trater.] 





Nov. 15. 



Nov. 16. 



Nov. 17. 



Nov. 18. 



Nov. 19. 



Nov. 20. 



Pool I: 



Agar, 25" C 



1,300 

 2,400 



1,500 

 19,000 



500 

 10,000 



1.000 

 4,000 



16,000 

 84,000 



20,500 

 42,000 



Agar, 37° C 





1,850 



10,000 



5.250 



2,500 



25,000 



31, 250 



Pool III: 



Agar, 25° C 



400 

 800 



3,000 

 5,100 



220 

 7.100 



300 

 2,000 



SO 



80 



16 



20 



Agar, 37° C 





600 



4,050 



3,700 



1,150 



55 



18 





Table XI. — One-fourth part per million of available chlorine as calcium 

 hypochlorite, added daily to water in swimming pools, week of 

 December 6 to 11, 1915. 



[Bacteria per cubic centimeter of water.] 





Dec. 6. 



Dec. 7. 



Dec. 8. Dec. 9. 



Dec. 10. 



Dec. 11. 



Pool I: 



Agar, 25° C - 



20 

 160 



10 

 30 



30 

 210 



10 



20 



160 

 390 



Agar. 37° C 



100 380 



Average _- _. . 





90 



20 



120 



55 200 



275 



Pool III: 



Agar, 26° C - 







60 

 240 



50 



600 



180 

 2,900 



2,700 

 28, 500 



1,200 

 13,000 



29, 000 

 44, 000 



Agar, 37° C 





150 



325 



1,500 



15, 600 



12.500 



36, 500 





Table XII. — Average bacterial counts of pools. 

 [Bacteria per cubic centimeter of water.] 

 , 25° INCUBATION. 



Table. 



Monday. 



Tuesday. 



Wednes- 

 day. 



Thursday. 



Friday. 



Saturday. 



II . 



1,760 



26,450 



3,670 



7,750 



700 



55 



100 



44,000 



1,300 



400 



40 



250 



1,713 



80 



900 



24,000 



14,800 



30 



1,550 



1,500 



3,000 



30 



8,130 



75,000 



7,330 



12,800 



370,000 



43,330 



50 



50 



500 



220 



105 



63,300 



40,000 



28, 670 



1, 770, 000 



2, 050, 000 



133, 330 



85 



1,165 



1,000 



300 



1.355 



50, 000 



214, 000 



846, 700 



276. 670 



5. 250, 000 



223. 330 



90 



115 



16.000 



30 



610 



703, 000 



153,300 



118, 700 



165, 000 



17. 000. 000 



706.670 







55 



20, 500 



16 



14,580 



III 



IV 



V 



VI - 



VII 



VIII 



IX — 



( I 



^llll 



XI 



Average .. .- 



7.838 



4,350 



47,046 



371. 745 



625,231 



1, 716, 529 





