96 PHYSIOLOGY. 



through liquid held between the tongue and the soft palate. Panting, 

 whistling, blowing, spitting, sucking, and drinking are also modifica- 

 tions of respiration. In case of choking it is well to hold the head for- 



Jl 



II 



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. 



100 CUBIC INCHES. 



m 



^ AIR THAT CAN BE BUT IS SELDOM DRIVEN OUT. 



RESIDUAL AIR. 



100 CUBIC INCHES. 



AIR THAT CANNOT BE DRIVEN OUT. 



II 



t> 



-S -S 



- 



QU 



Figr. 44. Diagram of Lung Capacity. 



ward, and perhaps downward. A smart slap between the shoulders 

 sometimes helps dislodge anything stuck in the throat, and it may be 

 necessary, in addition, to hold a child with its head downward. 



