146 FARM ARITHMETIC. 



bushels an acre. What was the total cost of labor per 

 bushel in 1855? In 1906? 



495. In 1830 the cost of human labor was $3.55 and 

 animal labor $0.28 for the production of an acre of wheat ; 

 in 1906 the cost of human labor was 66 cents and animal 

 labor $1.36. The production in both instances was 20 

 bushels an acre. What was the cost of labor per bushel 

 in 1830? In 1906? 



American Cradle. 

 The tool used for reaping until after the middle of the nineteenth century. 



496. In 1830 the cost per acre of oats was for human 

 labor $3.73 and for animal labor $0.12. In 1906, the cost 

 an acre was, human labor $1.07, animal labor $0.53. The 

 production in both instances was 40 bushels an acre. 

 What was the cost of labor per bushel in 1830 ? In 1906 ? 



497. In 1866, the cost per acre of potatoes, yielding 

 110 bushels, was for human labor $5.45 and for animal 

 labor $1.15 ; in 1906 the cost per acre yielding 220 bushels 

 was, for human labor $3.80, and for animal labor $2.17. 

 What was the cost of labor per bushel in 1866 ? In 1906 ? 



498. In 1855 the cost per acre of cotton was, for 

 human labor $8.79, and for animal labor $1.95 ; in 1906 

 the cost per acre was, for human labor $6.61, and for 

 animal labor $1.34. The production in both instances 



