vi ELEMENTS OF GENERAL SCIENCE 



F. R. Moulton of The University of Chicago have contrib- 

 uted greatly to the chapters on astronomy ; and Mr. Earl 

 R. Glenn of The Lincoln School of Teachers College has 

 given invaluable assistance in connection with the chapters 

 on electricity, as well as in other parts of the revision. 

 While recognizing the valuable assistance given by those 

 to whom acknowledgment is made, the authors also assume 

 full responsibility for the materials included hi the book. 



OTIS W. CALDWELL 

 W. L. EIKENBERRY 



