X NOTE TO TEACHERS 



of the purpose of the exercise ; second, a brief description 

 of what was done ; and third, a statement of the things 

 learned or the conclusions drawn from the exercise. 



Questions at the beginning of each chapter are given as 

 problems to guide the pupils in their study. These, to- 

 gether with the questions at the end of the chapter, are 

 suggested as a basis for the class discussions. It is believed 

 that a few leading questions of this type will stimulate the 

 pupils to independent thought and to organization of their 

 knowledge. 



In order to adapt the work to the individual interests and 

 capabilities of the pupils, it seems desirable that students 

 make reports to the class on some subjects of which they 

 have made special study. As an aid in this line of work a 

 few references are given at the close of each chapter. 



The stress to be laid on the various chapters depends on 

 the environment of the pupils, whether it is urban or rural. 

 In accordance with this environment some chapters may be 

 passed over lightly, while others should receive special 

 attention. 



