240 



Stephen DeM. Gage 



influencing the character and quantity of the bacterial content, all of 

 which will be reported elsewhere by another department by whom 

 these samples were collected. 



TABLE 6. 



Numbers of Bacteria Determined at 20° and 40° C, and the Corresponding Bacterial 



Ratios on Samples of Sea Water. 



Bacteria per c.c. 



Less than 100 



Between 100 and 500 



" 500 and 1,000 



" 1,000 and 5,000. . . 



" 5,000 and 10,000. . 



10,000 and 50,000. 



Over 50,000 



20° C. 



Bacteria 

 per c.c. 



78 



370 



700 



2,500 



5,800 



19,400 



700,000 



40° C. 



Bacteria 

 per c.c. 



6 



30 



170 



223 



5 



30 



86 



Acid- 

 Producers 



5 



17 



no 



15s 



4 



19 



60 



Ratio of 



20° Bac- 

 teria to 40° 

 Bacteria 



7.7 

 I 



24 



20" Bac- 

 teria to 40° 



Acid- 

 Producers 



6.4 

 4.6 

 iS-7 

 6.2 

 o. I 

 o. I 



40" Bac- 

 teria to 

 Acid- 

 Producers 



83 

 57 

 6s 

 69 

 80 

 63 

 70 



The monthly averages of the determinations of bacteria at 20° 

 and 40° C, and the corresponding bacterial ratios on all samples 

 of the canal water, Applied 216 and Applied 219, are shown in 

 Tables 7, 8, and 9. Comparing the canal results with those from 

 Applied 216, the yearly averages show us that treatment of the canal 

 water by coagulation and sedimentation removed about one-half 



TABLE 7. 



Canal: Average Monthly Numbers of Bacteria at 20° C, at 40° C, and of B. coli, and the 



Bacterial Ratios. 



1905 



January 



February. . . . 



March 



April 



May 



June 



July 



August 



September . . 

 October .... 

 November. . . 

 December . . . 

 Average 



Bacteria 



4o°-B. coli 



Ratio 



70 

 69 

 59 

 72 

 63 

 58 

 57 

 53 

 70 



25 



66 

 74 

 61 



of the bacteria contents of the water. On the other hand, the ratios 

 show us that the removal of bacteria capable of growing at 40° and 

 of B. coli was less than that of the total bacteria. Furthermore, 



