CONTENTS XV 



CHAPTER XL. THE EXCRETION OF WASTE FROM THE BODY. . . 280 

 Need for excretion The kidneys Conditions affecting excre- 

 tion Practical exercises. 



CHAPTER XLI. THE SPECIAL SENSES 284 



Function of sensations The special senses The end organs of 

 special sense Sight and hearing Practical exercises. 



CHAPTER XLII. THE EFFECT OF DRUGS ON THE BODY 291 



Drugs Use of drugs Tea, coffee and other beverages To- 

 bacco Alcohol Patent medicines. 



