IV FOREWORD 



pends upon the personality of the teacher. No style of 

 presentation is probably best for all. It is hoped, how- 

 ever, that the point of view developed by the material 

 selected, and presented in a way that has been found to 

 be effective, may be helpful to teachers who wish their 

 pupils to realize that one must live in intelligent partner- 

 ship with nature, and therefore must become acquainted 

 with nature. 



JOHN M. COULTER. 



