iv PREFACE. 



We both desire to express our obligations to Miss 

 Frances F. Bauman, who placed freely at our disposal the 

 results of her long and eminently successful experience 

 in teaching Physiology to children. 



As appendices to certain of the chapters there are 

 practical directions for the illustration of various facts 

 in Anatomy and Physiology, which can be shown to pu- 

 pils without any special apparatus, or any material not 

 easily obtained. 



Particular attention has been given to the action on 

 the body of the more commonly abused stimulants and 

 narcotics, especially alcohol. 



H. NEWELL MARTIN. 



JOHNS HOPKINS UNIVERSITY, June 30, 1884. 



