1235 



This proves tliat the moment of the opening of the glottis that 

 brings tlie lungs into connection with the bncco-pharyngeal cavity, 



-a 

 9- 



Ó 



Q 



1 2 8 



1 2 3 



iV. 



K. 



G. 



Vp. 



P. 



Opening and closure of the nos- 

 trils. 



Bucco-pharyngeal ventilation. 

 Pressure in the bucco-pharyngeal 

 cavity (at the rightside, scale in 

 cm. water). 



Registration of the movements 

 of the throat. 



Opening and closure of the glottis. 

 Pulmonary ventilation. 

 Pressure in the lungs (scale in 

 cm. water). 



must be placed on the ordinate 1. The period 1—2 is consequently 

 the duration of the expiration of the lungs. 



