Preserving Green Forage 47 



Air can be taken out of the silo in larger 

 quantities from the bottom and central parts 

 of the silo than can escape from the top. 



While the air is going out of the silo, there 

 can be no ingress; and, as soon as egress 

 ceases, the air passages should be closed, by 

 stopping the mouths of the perpendicular pipes 

 g and m. 



The governor will take off the lateral press- 

 ure from the walls. There will be nothing 

 like the pressure of an air cushion in the nat- 

 ure of hydrostatic pressure. But there must 

 be weight enough upon the ensilage to press 

 it to such a degree that it may be cut verti- 

 cally from top to bottom, leaving a smooth, 

 solid front to prevent the ingress and action of 

 the air. 



