160 FORAGE CROPS 
While the various styles of silos here mentioned 
may all be good, there are several objections to 
stave silos that are intended to be permanent 
buildings out-of-doors. The staves are liable to 
shrink and the hoops to loosen when the silo is 
empty. In many instances, they are blown down 
in high winds, and even if not blown down they 
are racked and get out of plumb. It is also diffi- 
cult securely to anchor a permanent roof, and to 
connect permanently the staves with the founda- 
tion. It does not pay, in the long run, to make 
cheap staves silos. An all-wood frame round silo 
is a type that has given excellent satisfaction, 
especially when care has been given to securing a 
good lining, which can be accomplished only when 
it has a sufficient diameter to permit of “springing” 
the lining boards in place, rather than to have the 
lining perpendicular. There should be at least 
three layers of the wooden lining, with paper 
between, the first nailed on the studs, then a 
lining of tough building-paper; the second layer 
nailed so as to break joints, and another lining of 
paper; and the third nailed, breaking joints again. 
To prevent the decay of the inside lining, it should 
preferably be treated with a mixture of gasolene 
and coal tar, rather than paint. This preserves 
the wood, to some extent prevents the entrance of 
moisture, and is not brushed off by the pressure 
of the silage as paint is likely to be, 
