CHAPTER VII. : 



On RESPIRATION. 



IVESPIRATION consists in the inhalation and 

 exhalation of atmospheric air into the lungs of 

 man and quadrupeds, or analagous viscera of 

 other animals; part of the air is there absorbed, 

 and another part is exhaled, but is altered in its 

 properties, only part returning in the state of at- 

 mospheric air, and the remainder in the state of 

 fixed or carbonic acid air, and of phlogisticated 

 or azotic air, accompanied with a considerable 

 quantity of moisture. It is not necessary here 

 to explain the uses of respiration in the animal 

 oeconomy, that having been already dorie by 

 several eminent physiologists, but to shew the 

 peculiarities of the organs destined to that func- 

 tion in the horse. 



I 2 The 



