Rates of Growth of Individuals 



31 



that in 24 hours the volume increased about 35 times, 

 while at each sporulation only 16 young organisms are 

 usually produced. It is possible that the matrix of the 

 spores constitutes over half of the parent's bulk; or it 



210 280 360 



Time in minutes 



Figure 15. Growth in length of two chains of Bacillus ramosus in a hang- 

 ing drop of broth kept in darkness. Length, which is proportional to volume 

 in this form, is plotted logarithmically. A, temperature 17.0° to 18.2° ; B, 

 temperature 16.0° to 16.5°. (Data of Ward, '95, pp. 405-407). 



is possible that water is discarded and the other mate- 

 rials are condensed in the process of spore formation. 

 The rate of growth and the length of one generation 

 could be retarded by the peculiarities of the host 

 (Hartman, '27), the temperature of cultivation in vitro 



