METHODS OF STUDYING AGRICULTURAL QUESTIONS 431 



unusually large number of hogs were fed, leaving a relatively 

 short supply for the market. Before drawing conclusions, how- 

 ever, other factors need be carefully investigated to make sure 

 that other important forces were not operating simultaneously. 

 These facts are presented in this form in order to illustrate this 



TtM£ BrMoHTttl AMD BY YCAKS < 



Figure 24. — In the winter of 1916 and 191 7 many dairy farmers were im- 

 pressed with the idea that it would pay well to buy feed in the summer 

 and store it for use in the winter. A study of this chart should make one 

 better able to judge whether the conditions of the feed market in 1916 

 and 191 7 were normal or exceptional. This is given to illustrate the way 

 in which statistical study may be used in giving a broader basis for pass- 

 ing judgment on a question of this kind. 



well-known method of putting statistical data in such form that 

 their relations are easily comprehended. 



The experimental method. The experimental method may 

 be used to throw light upon many problems in agricultural 

 economics. For example, in order to carry on investigations in 

 intensity of culture, this method must be employed. Some of 

 the data essential to the analysis of the economic problems of the 

 farm can be secured by keeping records upon farms under the 

 management of intelligent farmers with whom it is possible to 



