MEAT. 91 



animal heat ; and as we put more coals on 

 a fire on a cold day to keep our room 

 warm, so we eat more food on a cold day 

 to keep our body warm. 



Q. Why does COLD produce HUNGER ? 



A. 1 st The air contains more oxygen 

 in cold weather ; and as fires burn fiercer, 

 so animal combustion is more rapid : and 



2ndly We are more active in cold 

 weather; and increased respiration acts 

 like a pair of bellows on the capillary 

 combustion. 



Q. Wliy does rapid DIGESTION produce a 

 craving APPETITE? 



A. This is a wise providence to keep 

 our bodies in health ; in order that the 

 body itself may not be consumed, it 

 gives notice (by hunger) that the capillary 

 fires need replenishing. 



Q. Why do we feel a desire for ACTIVITY in 

 cold weather ? 



A. 1st Because activity increases 

 the warmth of the body, by fanning the 

 combustion of the blood: and 



2ndly The strong food we eat creates 

 a desire for muscular exertion. 



