PURE AIR 105 



tubes is also nicely shown in the left lung in the figure. 

 From books we can learn that the lungs are pink in 

 color, have thousands of air-cells, and are extremely 

 elastic. 



The vital organs of many common animals are very 

 similar to our own. On this account, the best way 



Trachea 



Showing trachea, right lung, and bronchial tubes of left lung. 



fully to realize the vast number of air-cells and blood- 

 vessels in our lungs and the remarkable power of 

 expansion these two most useful organs have, is to see 

 the lungs of some animal inflated. Children pay to 

 see many things in museums and other places, but few 

 of these are so curious and interesting as such an ex- 

 periment. The lightness and elasticity of the lungs are 



