118 LUNG CAPACITY. 



indicating the degree by correspondingly lowering the hand. 

 This air that can be breathed out beyond the ordinary expira- 



COMPLEMENTAL AIR. 



120 CUBIC INCHES. 

 AIR THAT CAN BE, BUT SELDOM IS, TAKEN IN. 



TIDAL AIR. 20 to 30 Cubic Inches Air. Taken In 

 and Sent Out at Each Breath. 



RESERVE AIR. ^ 



C5j 



I 



100 CUBIC INCHES. 



AIR THAT CAN BE, BUT SELDOM IS, DRIVEN OUT. 



RESIDUAL AIR. 



100 CUBIC INCHES. 

 AIR THAT CANNOT BE DRIVEN OUT. 



f 



Fig. 46. Diagram of Lung Capacity. 



tion is called the Reserve Air, and is reckoned at about 100 

 cubic inches. 



