no 



BOTANICAL GAZETTE 



[FEBRUARY 



f 



temperature and moisture supply, the high nitrogen-high tempera- 

 ture series could have been maintained in practically continuous 

 vegetation without any tendency to reproduce. The reason for 

 this belief was the failure of this series to produce any stem (culm) 

 until the water supply fell below the normal previously maintained. 



Chemical examination of tissues 



In order to ascertain; if possible, the character of the internal 

 processes that determine this very striking formative effect of the 



I 



*-■ 



OianA 



■ ■&. 



**» 



^PM 



jMIa 



Fig. 6. — Phosphorus series, warm house: N and K treatment of nos. 6, 8, 12, and 

 15 "normal" (same as no. 25 in fig. 4). 



higher temperature in the presence of high nitrogen supply, tissue 



from 



gm. of total plants from cultures nos. 44, 24, 108, 87, and 104. 

 The plants were selected so that the sample equaled 100 gm 

 Table III shows the very low percentage of stem material at the 

 higher temperature. Since both leaf-blade and leaf -sheath are 

 active organs in cereals, both were included. The second column 

 in the table shows the green weight in grams of this leaf tissue. 

 The first column in table VI shows the date and hour of taking these 

 samples. 



