176 



The Roots of the Wheat Plant. 



circumstanced, as may be seen in the annexed diagram, where 

 the rooting process is just commencing. 



r^ 



Diagram 2 (two- thirds of the actual size).— Blade of wheat rooting badly from deep sowing, 

 a a, joint roots. 



This evil, however, rectifies itself to a considerable extent in 

 winter sown wheat, but in spring wheat deep sowing always 

 irretrievably weakens the crop, as there is not time to remedy 

 the evil in the way pointed out. 



Upon this subject the following experiments by Petri may not 

 be inaptly quoted : — 



Seed sown to 

 the depth of 



i inch 



1 



2 

 3 

 4 

 5 

 6 



Came above 

 ground in 



Number of plants 

 that came up. 



11 days iths. 



12 



18 

 20 

 21 

 22 

 23 



All. 



iths. 



•Iths. 



4ths. 



Iths. 



*th. 



