ACADEMIA DE CIENCIAS DE LA- HABANA 



253 



TABLE XI.— BACTERIA RESEMBLING B. COLI COMMUNIS IN 



EFFLUENTS (1) FINAL FILTERS, TORRESDALE, 



FOR YEAR 1917 



Bacillus coli 



One c. c. tests 



Ten c. c. Tests 



No. of Total Number Per cent. Total Number Per cent, 

 test days number + + number + + 



January. . . . 

 February . . . 



Marcli 



April 



May 



June 



July 



August 



September. . 



October 



November . . 

 Deeember ... . 



Tetáis .... 



Averages .... 



Per oent. time 



31 



27 

 31 

 30 

 31 

 30 

 31 

 31 

 30 

 31 

 30 

 31 



364 



31 

 27 

 31 

 30 

 31 

 30 

 31 

 31 

 30 

 31 

 30 

 31 



364 



2.5 



364 



39 



10.7 



Year 



TOTALS AND AVERAGES FOR PREVI0U8 YEARS 



(1) After chlorine treatment. 



