DR. daubp:ny on the rotation of crops, etc. 



201 



Poppies. 



Years. 



50 



40 



30 



20 



10 



>lbs. 



10 



9. Polygonum fagopy rum. 

 Buckwheat, not being- an exhausting crop, does not vary more than can be explained 

 by differences of seasons and other contingent causes, the results being as follow : — 



