88 CHEMICAL ACTION. 



air), therefore the blood is more heated, 

 and every part of the body is warmer also. 



Q. Why does HARD WORK produce HUNGER ? 



A. Because it produces quicker respi- 

 ration ; by which means a larger amount 

 of oxygen is introduced into the lungs, 

 and the capillary combustion increased. 

 Hunger is the notice (given by our body) 

 to remind us, that our food-fuel must be 

 replenished. 



Q. Wliy does SINGING make us HUNGRY ? 



A. Singing increases respiration; and 

 as more oxygen is introduced into the 

 lungs, our food-fuel is more rapidly 

 consumed. 



Q. Why does BEADING ALOUD make us feel 



HUNGRY ? 



A. Reading aloud increases respira- 

 tion; and as more oxygen is introduced 

 into the lungs, our food-fuel is more 

 rapidly consumed. 



Q. Why do we feel MORE HUNGRY in the DAY- 

 TIME than in the NIGHT-TIME ? 



A. As we breathe more slowly during 

 sleep, therefore, less oxygen is introduced 

 into the lungs to consume our food-fuel. 



