Rates of Growth of Individuals 



41 



that the adult individuals at the close of each genera- 

 tion may be expected to be uniform in size. The effect 

 of various factors upon the rate of multiplication will 

 be mentioned later. 



^200 

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 JO 



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18 23 28 33 



Temperature in °C. 



38 



Figure 19. Effect of temperature upon the growth of Bacillus ramosus. 

 Spores were germinated at 22° five to eight hours before the observations 

 began. The bacilli were kept in the dark in a hanging drop of gelatin-broth 

 medium. (Redrawn from Ward, '95, p. 458, with the permission of the 

 Royal Society.) 



One of the points most desirable to know is whether 

 the shape of the curve of growth in volume is changed 

 by diversity of temperatures. The data of Popoff 

 (figure 13 above) might be taken to indicate that it is, 

 but the difference of shape is within the range of error 

 in the data. 



