

FURNITURE, AND ITS USES. 233 



forded by their numerous cells, and thus ex- 

 posed to the atmospheric air. This produces 

 a most surprising change ; and the blood is now 

 sent back into the left auricle and ventricle of 

 the heart, to be distributed all over the system, 

 in a renovated (renewed) state. Its color is 

 changed to a bright scarlet; it has lost its 

 superabundance of carbon, and its other bad 

 qualities, and it has acquired new life and new 

 spirit. 



About the precise nature of this change 

 whether the blood takes in something from 

 the air, or whether the air takes something 

 away from the blood, there has hitherto been 

 a great difference of opinion ; and even now 

 the point is not wholly settled. It is sufficient 

 for us, in a book like this, to know that a 

 change does take place, and what its results 

 are, in regard to health. 



NATURE OF THE AIR. But I must not 

 pass over this part of my subject, without men- 

 tioning the changes which take place in the 

 air which, in the lungs, comes in such close 

 contact with the blood. This air, in its natu 

 20* 



