318 SOILING CROPS AND THE SILO. 



Excessive dampness may be prevented by making 

 an air space in the wall while it is being built, or by 

 lining the wall on the inside with one thickness of 

 brick and by giving due attention to ventilation. 



The danger from frost will not be present 

 except in cold climates. The air space in the wall, 

 or the inner brick lining above referred to will also 

 help materially to ward off frost. When neither is 

 present, protection may be afforded by covering the 

 outer wall with a lining of boards nailed to studding 

 so as to form an air space between the lining and 

 the wall. The aim should be, however, to construct 

 the wall so that such lining on the outside would not 

 be necessary. A stone silo properly built should last 

 indefinitely without any form of renewal except in 

 the inner lining and in the covering over the frame- 

 work of the roof. 



Forms of Construction. Stone silos may be 

 built square, rectangular or round and they will 

 usually be located outside, but may also be placed 

 inside the barn or stable. The aim should be wher- 

 ever practicable to build them round. When this 

 cannot be done, the corners inside should be rounded 

 more or less to facilitate the settling of the silage. 



The Foundation. The foundation of the stone 

 silo may be made in the same way as the foundation 

 for any structure in which permanency is desired. 

 Every care should be taken to preserve it from the 

 action of frost when built in a cold climate, lest crack- 

 ing of the walls should follow. As the structure is 

 heavy, the foundation should go down to solid earth. 

 If ,the drainage below is not complete it should be 

 made so by laying tiles under the wall or adjacent 



