v i PREFACE 



raent of the pupil. We hope that the scientific informa- 

 tion will enable him to appreciate better the natural phe- 

 nomena going on around him. The scientific training 

 should enable him to observe more accurately, to inter- 

 pret more sanely, to understand the vital importance of 

 every day affairs, and, perhaps most important, to train 

 him to apply acquired knowledge to useful ends and 

 thus become a better citizen of his community. 



We wish to express our sincere appreciation to Mr. 

 J. C. Hanna, High School Supervisor for the State of 

 Illinois, formerly principal of the Oak Park, Illinois, 

 High School, for writing the Introduction and for his 

 untiring inspiration and advice during the seven years 

 in which we have been developing this course. It is due 

 to Mr. Hanna 's firm belief in the general science idea 

 that this work has become a reality. 



We wish also to express our appreciation for the advice 

 and criticisms given us by the teachers who have been 

 associated with us in the teaching of this course, espe- 

 cially for the valuable suggestions and assistance in proof 

 reading by Miss Rachel Ott and Miss Ruth Williston 

 of the Oak Park High School, and by Mr. F. L. Orth, 

 Head of the Science Department of the New Castle, Pa., 

 High School. 



To all who have in any way contributed in the 

 preparation of this work, we hereby make grateful 

 acknowledgment. 



A. L. W. 

 J. L. T. 



