iv Preface 



Special effort has been made to utilize in the text of the 

 several chapters the latest teachings of modern hygiene 

 regarding the nature and propagation of bacteria, the 

 prevention and restriction of disease, and the preservation 

 of health. 



Sundry sections have been printed in smaller type. 

 These may be omitted if it is deemed necessary to shorten 

 the course in physiology. 



This text-book complies fully with the laws of those 

 states which require the study of the nature and the effects 

 of alcohol, tobacco, and other narcotics upon the human 

 system. 



The author would acknowledge his indebtedness to 

 Dr. Margaret B. Wilson of New York City for editorial 

 assistance in revising the manuscript and reading the 

 proof. 



A. F. BLAISDELL 



BOSTON, June, 1902 



PUBLISHERS' NOTE 



The author of this book has written an additional chapter 

 (Chapter XV) on The Cause and Prevention of Tuberculosis, 

 or Consumption. This has been done in accordance with the 

 advice and suggestion of those educators and physicians who 

 believe that pupils in our public schools should be taught the 

 simplest facts concerning the cause and prevention of this 

 dread disease. 



May, 1910 



