90 THE HUMAN BODY. 



29, Why is not pie-crust as digestible as bread? Why is food 

 fried in fat indigestible? 



31, What mineral do we take pure ? Are mineral matters 

 changed by digestion? 



32, What is the proportionate amount of water in the body ? 



33, Is drinking-water ever absolutely pure? What sometimes 

 happens to water which is carried through lead pipes? What 

 kinds of pipes are safer? What are symptoms of lead-poisoning? 



34, How far must a well be from all filth to be safe? Is it always 

 safe at that distance ? How may aqueduct-pipes become dangerous ? 



35, Can the body adapt itself to different habits of eating and 

 drinking ? 



36, Do the same rules for eating and drinking always apply to 

 all? 



37, What is nature's guide to right habits of eating and drinking? 

 Is the appetite always healthy ? 



38, Under what circumstances is it necessary that a large num- 

 ber of people should adopt the same habits of eating and drinking? 

 What is a sufficient amount of food daily for a man ? 



SECTION II. 1, What are stimulants? What are narcotics ? Is 

 the same thing ever both a stimulant and narcotic? 



2, What service does a stimulant render in digestion ? 



3, What is the immediate effect of tea and coffee? Are they 

 ever injurious? 



5, Should growing children use them ? 



6, What is the first effect of tobacco ? What are its later effects ? 



7, What is its effect on the appetite ? on the stomach ? On the 

 nerves ? 



8, What is its effect on the heart ? 



9, Have boys any good reason for using tobacco ? 



11, 12, What is the effect of opium in small doses ? In large 

 doses ? 



13, What is the effect of the opium habit on the moral nature ? 



14, What is the effect of opium on the digestion ? 



15, Under what condition only may opium be rightly used ? 



16, What does alcohol come from ? 



17, What is wine ? How much alcohol does wine contain ? What 



