272 SOILING CROPS AND THE SILO. 



this passageway the doors of the silo should open. 

 The passageway should he amply provided with 

 light. When silos are located outside the barn, 

 stable br shed in which live stock are fed it is simply 

 impossible to locate them so conveniently to the 

 center of feeding as when they form a part of one 

 or the other of those buildings. 



Different Forms of Construction. — In form, 

 silos have been built square, rectangular, octagonal, 

 and round or circular. Until within a comparatively 

 recent period the rectangular form was usually 

 adopted by those who built silos, but, since about 

 1890 the round silo has come so generally into favor 

 that in a very considerable degree it is superseding 

 the rectangular mode of construction. 



The square silo may be somewhat more cheaply 

 constructed than the rectangular silo of equal ca- 

 pacity, since the wall space is not so much. When 

 the conditions are suitable for placing it, and where 

 the size is nicely adjusted to the amount of silage 

 required, the square silo would seem preferable to 

 the rectangular form. But if a division is to be 

 made in the silo, it will prove more costly to make 

 it than in a rectangular silo, since the space across 

 it is relati^'ely greater. Both square and rectan- 

 gular silos are more commonly placed inside of a 

 barn or stable, and within these it is not generally 

 so easy to secure space of the proper dimensions for 

 a square as for a rectangular silo. 



The rectangular silo has been found specially 

 adapted for being placed within a building that is in 

 process of erection or that is already built. When 

 wanted, partitions can be put into it at a minimum of 



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