84 CHEMICAL ACTION. 



Q. What are CAPILLARY VEINS ? 



A. Veins as small as hairs running 

 all over the body; so called from the 

 Latin word " capilla'ris" (like a hair j. 



Q. Do these CAPILLARY VEINS run all over the 

 human body ? 



A. Yes. Whenever \Aood flouis from 

 a wound, some vein must be divided ; 

 and as you cannot insert a needle into any 

 part of the body without bringing blood, 

 therefore these little veins must run 

 through every part of the human frame. 



Q. How do HYDROGEN gas and CAHBON get 

 into these very little veins ? 



A. The food we eat is converted into 

 blood, and blood contains both hydrogen 

 and carbon. 



Q. How does COMBUSTION take place in the 

 veins ? 



A. The carbon of the blood combines 

 with the oxygen of the air we breathe, 

 and forms into carbonic acid gas. 



Q. What BECOMES of this CARBONIC ACID GAS 

 formed in the human blood ? 



A. Some of it is thrown off by the 

 breath ; and the rest of it is absorbed by 

 the blood, to keep up the animal heat. 



