RATE OF GROWTH OF BACTERIA 



n 



25 



?o "30 Ho 50 ^0 70 



Mean Number of Flies per Bottle. 



Fig. 4. Influence of Density of Population on Reproduction Rate of. 



Fruit Flies. 

 Reprinted from 'The Biology of Population Growth" by Raymond Pearl, 

 by and with permission of and special arrangement with Alfred A. Knopf, Inc. 



