BULLETIN 748, U. S. DEPARTMENT OF AGRICULTURE. 



The hours of man labor and horse labor do not vary greatly from 

 one period to another. Moreover, the quantity of seed planted per 

 acre will not change perceptibty throughout a given period, and the 

 applications of manure or fertilizer are not likely to increase or 



INDIANA 



• Location of factories operating /9/4--/9/S © Location of idte -factories 



'*%& Locaf/on of area s ft/died 



Fig. 1. — Map showing the districts in which records were obtained, also indicating 

 the location of the beet-sugar factories in Michigan and Ohio. ' 



decrease to any marked extent. Other necessary supplies will remain 

 fairly constant. In presenting accompanying tables these facts have 

 been kept in view, so that if the reader wishes to figure the cost of 

 production on the basis of prices other than those prevailing when 



