112 Scientific Proceedings. Royal Dublin Society. 



4. The weight of the tuberous roots of the ringed plants was approximately a 

 quarter that of the unringed ; the weight of the stem, on the other hand, was more 

 than 1-2 times as heavy. 



5. It was concluded that the activity of the cells of the apical meristem was 

 not controlled by the supply of organic substances available, but was, on the 

 contrary, determined by autogenous changes within the growing point. No 

 evidence was obtained of the presence of a factor correlating the activity of the 

 apical meristem and the growth of the tubei'ous roots. 



6. It was pointed out that the experimental results were in accord with the 

 view that the rate of growth of the stem was conditioned by the catalytic activity 

 of the cells of the apical meristem. 



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