Table 2. Activity of various known components of tomato juice and related com- 

 pounds on the increase in fresh weight of tissue cultures. (Differences smaller than 15 

 per cent are generally not statistically significant.) 



* Morel's crown-gall strain of W. tabacum. 



t Enzymatic casein hydrolysate (vitamin free) 0.5 per cent solution obtained from 

 the Nutritional Biochemicals Corp., Inc., Cleveland, Ohio. 



X When the same concentrations appear twice in this column the experiments have 

 been repeated at different times. 



