ANIMAL HEAT. 87 



A. A starved man shrinks just as a 

 fire does, unless it be supplied with 

 sufficient fuel. 



Q. What is the FUEL of the BODY ? 



A. Pood is the fuel of the body ; and 

 the carbon of the food mixing with the 

 oxygen of the air, evolves heat in the 

 same way that a fire or candle does. 



Q. Why is EVERY part of the BODY WARM ? 



A. As the capillary veins run through 

 every part of the human body, and the 

 combustion of blood takes place in the 

 capillary veins, therefore every part of 

 the body is warm. 



Q. Wliy does RUNNING make us WARM ? 



A. When we run, we inhale air more 

 rapidly ; and the rapidity with which we 

 inhale air fans the combustion of our 

 body, as a pair of bellows quickens the 

 flame of a common fire. 



Q. How does INHALING AIR RAPIDLY make the 

 tody feel WABM ? 



A. As the combustion of the blood is 

 more rapid, (in consequence of the 

 introduction of more oxygen from the 



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