1Q20] 



WA LS TER—BA RLE I ' 



123 



Fraction 3. 

 lower temperati 



Le higher amount of polysaccharides at the 

 has been noted. Table V shows that the 



leaves grown at the lower temperature contain a distinctly higher 

 average percentage of this fraction, although the order of difference 

 is not large. Tables IX and X show that there is no important 







* ■ 



Fig. 17 



Fig. 18 



Figs. 17-18. — Fig. 17, influence of heavy N and heavy K on maturation (photo- 

 graphed May 16): no. 49, heavy N+heavy K (warm house); no. 112, heavy 

 N+ heavy K (cool house); comparison with other sets not shown indicate that K 

 has no effect in causing difference; contrast heavy N cultures with normal N cultures 

 of fig. 16; fig. 18, influence of heavy N and extra heavy Pon maturation (photo- 

 graphed May 16): no. 63, heavy N+extra heavy P (warm house); no. 126, heavy 

 X+extra heavy P (cool house); contrast with nos. 63 and 125 (same treatment) 



* 



difference in the percentage of either N or P at the different tempera- 

 tures. The amount of phosphoprotein phosphorus seems to run 

 somewhat lower at the lower temperature (table VIII). 



In five out of six cases (cf. column 3, table XII, with column 5, 

 table VII) the amount of phosphorus in the NaOH extract exceeded 

 the phosphorus precipitable from that extract by 1 per cent NaOH, 

 indicating that either some organic phosphorus compounds had 



