PREFACE 



THIS book is intended to serve as a text-book on physi- 

 ology for such high schools, academies, and normal schools 

 as provide two terms, and occasionally only one term, for 

 this branch of study. For such secondary schools a shorter 

 and simpler book than the author's Practical Physiology is 

 needed. To meet this want the present book has been 

 written. 



The general plan of the author's larger book has been 

 followed and a certain amount of its material and many of 

 its expensive woodcuts have been utilized. The text has 

 been simplified throughout and a large amount of new and 

 instructive matter has been added. 



In this book, as in all the other books of this series of 

 school physiologies, the text has been supplemented by a 

 large number of carefully graded and practical experiments. 

 For the most part they are simple and can be performed 

 with apparatus that is inexpensive and easily obtained. 



The few facts which the young student is able to learn 

 in school about the anatomy and physiology of the human 

 body are of little value in themselves. Such facts, however, 

 become of supreme importance and practical worth when 

 they enable him to understand a few of the great laws of 

 health and to apply them intelligently to his daily living. 

 Hence the author has aimed to lay marked emphasis upon 

 such points as bear directly upon personal health. 



iii 



M 207 



