242 AIR. 



A. 1st It gives vitality to the 

 blood: and 



2ndly It is the cause of animal heat. 



Q. How is FOOD converted into BLOOD ? 



A. After it is swallowed, it is dis- 

 solved in the stomach into a grey pulp ; 

 it then passes into the intestines, and is 

 converted by the "bile" into a milky 

 substance (called chyle). 



Q What BECOMES of the milky substance, 

 called CHYLE ? 



A. It is absorbed by the vessels 

 called " lacteals," and poured into the 

 veins on the left side of the neck. 



Q. What becomes of the chyle AFTER it is 

 POURED into the VEINS ? 



A. It then mingles with the blood, 

 and is itself converted into blood. 



Q. How does the OXYGEN we inhale MINGLE 

 with the BLOOD ? 



A. The oxygen of the air mingles 

 with the blood in the lungs, and converts 

 it into a bright red colour. 



Q. What colour is the blood BEFOBE it is 

 oxydized in the lungs ? 



A. A dark purple. The oxygen 

 turns it to a bright red. 



