DIFFERENT TYPES OF SILO STRUCTURES. 33 



some people cannot notice it at all; but when a person is sus- 

 picious, he can generally discover it. So far as is known this 

 odor is not discernible in either butter or cheese made from 

 silage- flavored milk, nor does it seem to affect the keeping qualities 

 of the milk in any way. 



Different Types of Silo Structures. 



Silos may be built of wood, stone, brick, cement, tll3 or metal, 

 or partly of one and partly of another of these materials. "Wooden 

 silos may be built of several layers of. thin boards nailed to up- 

 rights, or of single planks (staves), or may be plastered inside. 

 The materials used will largely be determined by local conditions; 

 where lumber is cheap, and stone high, wooden silos will gener- 

 ally be built; where the opposite is true, stone or brick silos will 

 have the advantage in point of cheapness, while concrete and clay 

 block silos are likely to be preferred where great permanency is 

 desired or where cobble-stones are at hand in abundance, and 

 lumber or stone are hard to get at a. reasonable cost. So far as 

 the quality of the silage made in any of these kinds of silos is con- 

 cerned, there is no difference when the silos are properly built. 

 The longevity of concrete and tile silos is usually greater than 

 that of wooden silos, since the latter are more easily attacked 

 by the silage juices and are apt to decay in places after a number 

 of years, unless special precautions are taken to preserve them. 

 A well-built and well-cared-for wooden silo should, however, last 

 almost indefinitely. 



As regards the form of the silo, it may be built in rectangular 

 form, square, octagon or round. We have already seen that the 

 most econdbilcal of these is ordinarily the round form, both be- 

 cause in such silos there is less wall space per cubic unit of 

 capacity, and in case of wooden round silos, lighter material can 

 be used in their construction. The only place where silos of 

 square or rectangular form are built now is inside of barns, where 

 they fit in better than a round structure. "We shall later on give 

 directions for building silos inside of a barn, but shall now go 

 over to a discussion of the various forms of round silos that are 

 apt to be, met with. More round wooden silos have been built 

 during late years in this country than of all other kinds of silos 

 combined, and this type of silo,, either built of uprights lined in- 

 side and outside with two layers of half-inch boards, or of one 



