EXPERIMENT STATION BULLETINS. 



237 



these qualities they will crack or spring and air will be admitted to 

 effect the spoiling of the ensilage. 



4. The walls should be sufficiently nonconducting (''warm") to pre- 

 vent extensive freezing of the outer portions of the ensilage in cold 

 weather. Such portions as adhere to the Avails by freezing are likely 

 to spoil if they thaw out slowly. 



Fig 1. Silo owned by W, E. Arnold, Jamestown Midi. Built in 1901 of field stone. 

 Height 30 ft. Diameter IG ft. Walls IS inches thick. 



It has been found that considerable losses from excessive fermenta- 

 tion may take place because of defective walls and still the ensilage 

 may appear reasonably good and may be relished by the animals to 

 which it is fed. 



SILO TYPES AND MATERIALS. 



There are two general types of silos: viz., the square and the round, 

 with some intervening modifications. 



The early silos were mostly, if not all, of the square type. They 

 were made chiefly of wood in this country. Square silos are seldom 

 made now; when made of wood it is not easy to make the walls 



