INTRODUCTION XI 



observation of those whose lives have been devoted to 

 the study. " 



This might be set forth as the guiding principle for the 

 study, not merely of "physics", but for the study of 

 the material phenomena of nature, of that which we call 

 Science. 



General Science in some form, as the introductory unit, 

 has come to stay. It will last longer than will its timid 

 opponents. The somewhat noisy war over the "project 

 plan" will subside. 



A thoughtful examination of the course as presented in 

 this book and the laboratory manual which accompanies 

 it, and above all experiment with it, will show whether 

 it is a working out of that plan of framing a course, 

 but what is of far greater importance, such trial of it 

 will show whether it supplies a real need in the first 

 high school year, and whether it helps to drown the many 

 voiced criticism of secondary school instruction as being 

 unrelated to "real life." 



JOHN CALVIN HANNA. 

 Illinois State Supervisor of High Schools, 

 Springfield, Illinois. 



