THE EARTH'S BOUNTY 



enter, so that no holes need be bored, as de- 

 scribed above. The openings at the plate 

 should always be provided, and the silo should 

 have some sort of ventilator in the roof. This 

 ventilator may take the form of a cupola, to 

 serve for an ornament as well, or it may be a 

 simple, galvanized iron pipe, 12 to 24 inches 

 in diameter, rising a foot or two through the 

 peak of the roof. 



The size of the silo will have to be deter- 

 mined by the number of cattle to be fed. Two 

 inches of the entire exposed surface must be 

 used each day, after the silo is once opened, or 

 there will be loss from spoiling. The accepted 

 estimate for feed is 40 pounds per day for 

 each cow. Calculating that silage will be re- 

 quired for 200 days in the year, the amount 

 to be stored for each member of the family 

 will be four tons, so the size of the silo should 

 be figured out on these lines. Twelve cows 

 will consume 48 tons of silage; the inside di- 

 ameter of the silo for such a herd should be 

 12 feet, 24 feet high, as then the necessary 



94 



