CORN. 165 



the center of the floor, and above these place ventilators, extend- 

 ing up to the top of the crib. These ventilators can be made by 

 first putting together some small square frames of two by four 

 studding, so that they will measure nine inches outside measure, 

 and nailing two strips, three inches wide, of inch boards to each 

 of the four sides. Probably four of these frames would be 

 needed for each ventilator ten feet long, as the pressure of the 

 corn would crush them if the space between frames was too 

 great. With a row of these ventilators placed five or six feet 

 apart dong the center of the crib, such thorough ventilation 

 would be secured that the risk of damage would be greatly re- 

 duced. About thirty feet of lumber would be required for 

 each ventilator ten feet long, and when once made they would 

 last for many years. When not in use they could be stored 

 .overhead. 



Our engraving on page 164 shows how the frames should 

 be made, and also a ventilator complete. 



