iv PREFACE. 



The benefits to be derived from a proper observance of the 

 laws of health cannot be over-estimated, and while teachers 

 inculcate abstinence from stimulants, they should impress 

 upon their pupils the observance of such practices with regard 

 to all the functions as would promote the highest possible 

 development of mind and body. 



The author acknowledges his indebtedness to the follow- 

 ing for valuable hints: Martin's "Human Body," Starling's 

 "Human Physiology," Blaisdell's "Young Folks' Physiology," 

 Steele's " Hygienic Physiology," " Manual of Hygiene," To- 

 ronto, Sir B. W. Richardson's " Cantor Lectures on Alcohol," 

 besides frequent reference to Gray, Foster, Huxley, Hare, 

 Sajous, Nettleship, Lees, and many others. 



WILLIAM NATTRESS. 



TORONTO, October, 1898. 



