156 ANSWERS TO PRACTICAL QUESTIONS 



worn next the skin, in all seasons of the year, is an 

 excellent precaution against unavoidable exposure. 



17. What causes the difference between the hard hand of 

 a blacksmith and the soft hand of a woman ? 



The varying thickness of the cuticle. 



(See Physiology, page 62.) 



1 8 . Why should a painter avoid getting paint on the palm 

 of his hand? 



(See Physiology, page 73.) 



19. Why should we not use the soap or soiled towel at a 

 hotel? 



Because of the danger of contracting disease through 

 the absorbents 01 the skin. (See Physiology, p. 73.) 

 There is a similar danger in using a hair-brush or a 

 comb at a barber shop. 



20. Which teeth cut like a pair of scissors ? 



The "back-teeth," as we commonly call them, when 

 moved laterally, cut somewhat in this way. In chewing 

 the food all the "tront teeth" act like scissors, as may 

 be readily seen by noticing their movements. 



2 1 . Which like ct chisel ? 



The incisors, or four front teeth of each jaw, have 

 knife edges ; the canine teeth have wedge-shaped edges ; 

 the bicuspids and molars have broader crowns. We can 

 work the jaws so as to make the front-teeth either pierce 

 like wedges or cut like scissors. 



