PURIFYING THE BLOOD 



RIGHT 



divides into two pipes, each called a bronchus, and each 

 passing into a lung. In the lung the bronchus divides and 

 subdivides into the bronchial tubes, finally becoming very 

 tiny air cells. This accounts for the lungs being soft and 

 spongy and extremely elastic. Actual examination is far 

 better than any mere verbal description, and as what the 

 butcher calls sheep's lights are but the lungs of the animal, 



one need not go 



far for an actual 

 speci men. I n 

 passing it may be 

 pointed out that 

 the body of a 

 dead rabbit will 

 provide numerous 

 illustrations con- 

 cerning bones, 

 joints, muscle, 

 nerves, &c. The 

 incoming breath 

 fills the air cells 

 of the lungs with 

 oxygen, which the 

 venous blood ex- 

 changes for its 

 poisonous car- 

 bonic acid, which 

 is expelled from 

 the body in the 

 outgoing breath. 

 And then the 

 purified blood is 



conveyed by the pulmonary veins into the left auricle of 

 the heart, ready to be sent again circling through the body. 

 Numerous organs of the body have not even been 

 mentioned, let alone described. This mere rapid survey 

 of but a few of its wonders must suffice to allow us to 

 dwell upon man's place in the general scheme of creation, 

 rather than to examine more closely into his structural and 

 functional excellences. 



DIAGRAM OF THE CIRCULATION OF THE 

 BLOOD. 



