MODIFIED EESPIRATORY MOVEMENTS. 403 



tions of the face muscles giving expression to the counten- 

 ance are, however, different in the two. 



All these modified respiratory acts are essentially reflex, 

 but, with the exception of hiccough, they are to a certain 

 extent, like natural breathing, under the control of the 

 will. Most of them, too, can be imitated more or less 

 perfectly by voluntary muscular movements; though a 

 good stage sneeze or cough is rare, 



