384 



HOYT S. HOPKINS 



TABLE 8 

 Showing the number of divisions per line for five-day {and ten-day) periods in several 

 lines of Paramecium aurelia (llg and lb) and P. caudatum {38a), growing in 

 various culture media {see explanation of tables). The organisms were culti- 

 vated on depression slides, renewed daily with fresh culture medium of hay 

 infusion in distilled water, with or without the salts mentioned 



