PAPERS ON WATER SUPPLY 



79 



of food material is transferred. 



All samples of water used were sterilized before inoculation, 

 the samples kept in hydrogen and nitrogen being in filter flasks, 

 the gas entering through the side tube and escaping through a 

 capillary tube at the top. The other samples were kept in 

 Erlenmeyer flasks. 



Table I gives the results of B. coll in several waters. The 

 constant k is obtained [rem the formula : 



*4 



i N 



in — 

 n 



t being time, In the natural log , 

 teria and n the final number. 



the original number of bac- 



3 i-5 o oo o 



^ *-> o oo o 

 ►> «_i a o o o o 

 > o 3 

 o 





o «> o o 

 o o to 00 



USNMN 

 r-T NH r-T 



OO O 

 O O O 

 O O O 



OO O* 

 IS O CO 



O 

 t 



> 



NMHH 

 g ^ t-NOOO 



-t-> 



to lO CO 00 



O O O O r-( 

 O O O O 



o o o eq 



® fl - 



t>SOOM 

 P" o w o 



U 09 lO 



IfllflO 



a 



o 



j o o o o 



rt o o o o 

 P o_ o_ o_ <N 



*i O M Oi ffl 



.2 oh ih t-h 

 Q N 



tf 



« co oo to 



owiaia 



03 



o o o o la 



" <=5 <=> O O 



fe *J o o o o 



HOOON 



00 



H-8 





