THE VITAMINES IN THE VEGETABLE KINGDOM 



69 



tuber be used. He thought that the disease of potatoes common in 

 the United States, and known as "spindling sprout disease," was due 

 to lack of these vitamine-like substances. 



Bottomley (183) also investigated the influence of crude nucleic 

 acid derivatives upon the growth of Lemna minor. The action, in 



FIG. 5. GROWTH OF PRIMULA AFTER VITAMINE ADDITION (ROSENHEIM) 



this instance, was similar to the activity of a sterilized suspension of 

 Asotobacter chroococcum. The combined activity of the two products 

 the suspension and the nucleotides were complementary to each 

 other. Purified adenine-uracil fractions showed no activity. 8 In 



3 Papers published by Jones (184) and also by Stead (185) may be looked 

 upon as reviews. 



