THE SILO 



137 



The silo must be almost air tight because the 

 air contains germs that will set to work upon 

 the silage and cause it to spoil and decay if 

 the air is not excluded. Silage is something 



Fig. 39. An artistic tile silo with double air 

 space in walls to keep out the cold. 



like canned fruit in this respect. The silo must 

 be strong because the green feed with which it 

 is filled is very heavy and packs down very 

 solidly. This exerts a tremendous pressure which 

 will spring or burst the walls of a poorly con- 

 structed silo and admit the air, causing the silage 

 to spoil. It should be perfectly smooth on the 

 inside because the silage should settle evenly. 



