THE EEASOS WHY. 245 



'.ir.dElisha sent a message unto him, saying, Go and wash in Jordan seven 



times, and thy flesh shall come agrahi to thee, and thou shalt 



be clean." ii KINGS v. 



Sensible perspiration is that moisture which exudes upon the 

 skin in drops large enough to be perceptible, when the body is 

 heated by exercise or other means. 



1013. Why does a sudden change from lieat to cold bring 

 on illness ? 



Because the effect of cold arrests the action of the vessels of the 

 skin, and suddenly throws upon the internal organs the excretory 

 labour which the skin should have sustained. 



1014. Why does a chill upon the sJcin frequently produce 

 inflammation of the lungs ? 



Because the lungs and the skin together discharge the chief pro- 

 portion of the watery fluid of the body. When the skin's action 

 is checked, the lungs have to throw off a much greater amount of 

 fluid. The lungs, therefore, become over worked, and inflam- 

 matory action sets in. 



1015. Why does cleanliness promote health ? 



Because every atom of dirt which lodges upon the surface of the 

 body serves to clog and check the working of those minute pores, by 

 which much of the fluid of the body is changed and purified. 



In the internal parts of the system, the Creator has made ample 

 provision for cleanliness. Every organ is so constituted that it 

 cleanses and lubricates itself. Every surface of the inner body is 

 perfectly clean, and as soft as silk 



Mature leaves to man the care of those surfaces which are under 

 his immediate observation and controul ; and he who, from idleness, 

 or indifference to nature's laws, is guilty of personal neglect, 

 opposes the evident intentions of the Creator, and must sooner or 

 later pay the penalty of disobedience. 



1016. Why does exercise promote health? 



Because it assists all the functions upon which life depend. It 

 quickens the circulation, and thereby nourishes every part of the body, 

 causing the bones to become firm, and the muscles to become full and 

 healthy. It promotes breathing, by which oxygen is taken into the 

 system, and carbon thrown off, and thereby it produces a higher 

 degree of organic life and strength than would otherwise exist. It 



