ii 4 



BOTANICAL GAZETTE 



[FEBRUARY 



Table V gives the distribution of the several fractions in the 

 samples analyzed. Particular attention is directed to the fact that 

 the temperature does not seem to have any important effect upon 

 the proportion of lipins (F^, except where extra phosphorus is 

 present, in which case a high temperature led to an increase in the 

 lipin material. The author regrets not being able to confirm this 



i 



Fig. ii. — Influence of supplementary K fertilization on heavy N fertilization: 

 nos. 50 and 113 received equal heavy doses of N in form of NaN0 3 ; nos. 100 and 38 

 received only "normal" N; all 4 cultures received equal heavy doses of K in form of 

 KC1; nos. 50 and 38 warm house; nos. 100 and 113 cool house; K failed to counter- 

 act effects of N at higher temperature. 



interesting observation by means of further analyses. The pro- 

 portion of fraction 2, which might quite properly be designated the 

 metabolic fraction, averages about 10 per cent higher at the higher 

 temperature. The proportion of fraction 3, or storage and skeleton 

 fraction, averages nearly 8 per cent higher at the lower temperature. 

 F % was analyzed for total N and total P. F 2 was analyzed for 

 total N (organic and ammoniacal only), total P, direct reducing 



