ENERGY SUPPLY OF THE CELL 



149 



560 millions, or 13 to 1. While a doubling of the cell 

 concentration may not bring about much effect, an 

 increase more than ten-fold causes a distinct rising of 

 the endpoint of fermentation. 



This better growth of streptococci in milk with 

 peptone accounts for the higher acidity generally 

 observed in peptone milk. Rahn (1911) described a 

 strain II, where addition of peptone changed neither 

 the acidity nor the number of cells, while with strain IV, 

 the number of cells was increased four to five-fold by 

 peptone, and the titrated acidity was doubled. 



The above table with different species of strepto- 

 cocci verifies all previous data. Strept. fecalis (human) 



