33- 



BOTANICAL GAZETTE 



[NOVEMBER 



sugars are low, and the reducing type falls to zero at the time of 

 seed formation. 



Fig. io. — Reciprocal fluctuation of carbohydrate and nitrogen in stems (cf. 

 figs. 4 and 7). 



Carbohydrate-nitrogen ratio. — According to the work of 

 Kraus and Kraybill on the tomato, high nitrogen in a plant is 



