IN HUMAN PHYSIOLOGY. 153 



4. Why is the back of a washer-woman's hand less 

 water-soaked than the palm ? 



The difference depends upon the relative abundance 

 of the oil-glands in different parts of the body. 



5. What would be the length of the perspiratory tubes 

 in a single square inch of the palm, if placed end to end? 



(See Physiology, page 72. 2,800 x T V in. = 2 e in.= 14 ft. 7 in. Answer.) 



6. What colored clothing is best adapted to all seasons ? 



Light-colored clothing is cooler in summer and warmer 

 in winter. 



(See Physiology, page 77 ; Natural Philosophy, page 246.) 



7. What is the effect of paint and powder on the skin ? 



They fill the pores of the skin, and thus prevent the 

 passage of the perspiration. Moreover, they often con- 

 tain substances which are poisonous, and being carried 

 in by the absorbents cause disease. 



(See Physiology, page 73.) 



8. Is water-proof clothing healthful for constant wear ? 



No. It retains the insensible perspiration by which 

 waste matter is being constantly thrown off from the 

 system. 



9. Why are rubbers cold to the feet ? 



They retain the insensible perspiration. The moisture 

 which gathers absorbs the heat of the feet, and readily 

 conducts it from the body. 



