30 

 800 



MORPHOLOGIC VARIATION 



6oc- 



4oc« . 



w 



20( 



M "TbO 



Concentration of Peptone. 



Fig. 7. Influence of Concentration of Nutrients on Rate of Growth 



OF Bacteria. 

 From "The Relation of the Concentration of Food Supply to the Genera- 

 tion-Times of Bacteria" by W. J. Penfold and D. Norris. Reproduced through 

 the courtesy of the Journal of Hygiene. (1913, 12, 527). 



