XI, B, 1 



de la Paz and Garcia: Use of Apomorphine 



57 



during emesis furnishes strong evidence that the glottis remains 

 closed after the increased intrapulmonic pressure has returned to 

 its level before the onset of vomiting. In order to carry on this 

 observation, two cannulas were inserted into the trachea, one 

 toward the glottis and the other toward the lungs. The free 

 ends of the cannulae were joined to a piece of glass tubing, so 



Fig. 1. Shows the connection of the glottis to 6, the mercury manometer, and to o, water-air- 

 pressure pump. 



that when the preparation was completed the respired air passed 

 from the lungs through one cannula, through the glass tubing, 

 through the other cannula, and out through the nostrils. Dur- 

 ing quiet respiration the cork cylinder previously inserted into 

 the glass tubing moved toward the glottis with each expiration 

 and toward the lungs with each inspiration ; however, as soon as 

 emesis set in, its movement ceased till the vomitus appeared in 



