16 



TRANSLOCATION OF PLANT FOOD IN WHEAT SEEDLINGS. 



TABLE 3. Relative amounts of plant material in the plumule and radicle during first 



15 days' growth. 



WATER CULTURE. 



NUTRIENT SOLUTION. 



In the water culture (Table 3) the weight of the plumule and the 

 radicle together increased daily at a much slower rate than did the 

 absorption of nitrogen, phosphoric acid, and potash; that is, while 

 the weight increased from 23 to 50 per cent the nitrogen increased 

 from 65 to 104 per cent, the phosphoric acid from 43 to 93 percent, 

 and the potash from 83 to 121 per cent. In the nutrient solution 

 the behavior was similar, only somewhat more pronounced. 



Considering the relative amounts of nitrogen, phosphoric acid, and 

 potash in the plumule and radicle, respectively, the table shows that 

 in distilled water the weight of the plumule increased at a slower 

 rate than did the translocation and accumulation of nitrogen, phos- 

 phoric acid, and potash. 



In the case of the radicle the increase in weight is only a little less 

 than the increase in the retention of nitrogen, phosphoric acid, and 



