34 LABORATORY LESSONS IN GENERAL SCIENCE 



contests are to be witnessed but not participated in by the 

 school body at large? What evils in matters of health re- 

 sult from over-training and excessive efforts? Why is it 

 that change in occupation may afford refreshment? How 

 is it that activities employing both hand and head are often 

 less tiresome than either mental or manual labor alone? 



STIMULANTS AND NARCOTICS 



1. Stimulating trade, stimulating political interest, 

 stimulating public opinion, are expressions frequently heard. 

 What is there common in their meaning? 



2. In what ways may a shower bath, or a sponge bath, 

 have a stimulating effect upon the body? What effect of 

 hot drinks taken into the stomach warrants speaking of 

 them as stimulants? Why is the alcohol of various drinks 

 and medical preparations a stimulant for the human body ? 



3. When a horse is stimulated under vigorous use of 

 the whip to make unnatural efforts in moving heavy loads, 

 what harm to the animal is likely from these efforts ? What 

 harm to the organs of the human body will probably result 

 from the use of alcoholic drinks even in small quantities? 



4. What is true of the number of people who begin the 

 use of alcoholic liquors and become addicted to the drink 

 habit, after they are thirty years old? What significance 

 has this ? Why is it that young men beginning the use of 

 intoxicating drinks are likely to become drunkards though 

 not planning to do so? 



5. Name some advantages to a person in having formed 

 the habit of doing what is for his own welfare. What is 

 the explanation of habit as a condition of the body? In 



