338 THE SMALL GRAINS 



the spread of weeds, carried from place to place in the 

 separator. All straw should be saved and carefully 

 stacked, or running the straw into the barn is still better, 

 if there is available room for it. The operation of the 

 machine must be constantly watched to see that all grain 

 is separated from the straw, that none of it blows over, 

 and that the cleaning is thorough. It will often be neces- 

 sary to readjust the concaves. 



