MANUAL OP NATDRB STUDY. 67 



skin is porous and therefore an absorbent. If the 

 water contains poisonous gas, or poison in solution, 

 the skin will take it up and carry it into the gen- 

 eral circulation of the blood and thus seriously en- 

 danger the health of the individual. For farther 

 remarks on bathing, see Second Year work and 

 Jenkins ' Physiology. 



4. Unwholesome drinks. — Under this heading 

 all drinks containing Alcohol as an active principle 

 may be considered. 



1. Cider. How made? Where does the alcohol 

 of cider come from ? What would be the effect of 

 habitual drinking of hard cider ? Real hard cider 

 is about one-tenth alcohol. 



2. How is alcohol made ? Make several experi- 

 ments with alcohol to show its evil effects. First : 

 put a small quantity in a cup or saucer and set fire 

 to it. Will it burn? Second: treat the white of 

 an ^%% in a cup or small vessel, with a quantity of 

 alcohol. Stir for a few moments. What is the 

 effect upon the egg? What then would be the 

 effect upon all proteids, or albumenoids in the 

 stomach if treated to a drink of alcohol? What 

 effect upon the brain ? Nerves ? Muscles ? Would 

 a small quantity of alcohol as found in hard cider, 

 if repeated several times a day for a few years, affect 

 our system? How is beer made? What is the 



