LESSONS ON QOKN. 19 



corn States. Explain the cause of the difference in climate and 

 agricultural products. What cities of the United States are the 

 leading markets and distributing points of the corn crop ? Compare 

 corn with other grains, both as to total yields and as to amounts 

 exported. 



Arithmetic. — Have pupils report these facts from their homes: 

 The number of acres planted to corn, the prevailing rent price per 

 acre, the total yield, the amount of fertilizers used per acre, the labor 

 required to prepare the seed bed, cultivate, and harvest the crop. 

 From these facts develop problems to determine the average cost of 

 growing an acre and of producing a bushel. Find the average yield 

 per acre and its value based on local prices. Is the corn of the com- 

 munity grown at a profit or loss ? Find the per centum profit or loss. 



WASHINGTON : GOVERNMENT PRINTING OFFICE : 1918 



