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. 



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. colt, AND THE 



BACTERIAL RATIOS. 



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, 



