•bry 



• Matter. 



Grammes. 



Nitrogen 

 and PqOs. 



Grammes. 

 1-3 



0.9 

 0.8 



•7 



3 o 9 12 IS 18 21 24 27 30 33 36 days. 



Fig. 15.— Diagram showing the Migration of Plant Constituents 

 INTO THE Grain of Wheat during the last Five Weeks before 

 Harvest. 



\.Face fage 64. 



