SUGGESTIONS TO TEACHERS XV 



Here is an unexcelled opportunity to impart much infor- 

 mation that is closely related to what has been learned. 

 Additional simple but instructive experiments by the 

 teacher may be introduced here. The class-knowledge 

 of each topic, whether gained from experience, learned in 

 the laboratory, or gathered from books, is to be associated 

 and unified by the teacher. If the laboratory hour be 

 regarded as a time of preparation for instruction, the 

 succeeding class period is a time for teaching. 



When a textbook is used, or any large amount of refer- 

 ence reading is assigned, the teaching plan must provide 

 for class periods given over more or less to quizzes upon 

 the assignment, and to discussions and explanations to 

 make sure that the readings are understood. 



