94 



first case the agency of volition is alone removed, and the respira- 

 tion continues through the influence of the eighth pair; in the 

 second, that of the eighth pair is removed, and the respiration con- 

 tinues as a function of volition ; but in the third, both influences are 

 destroyed at once, and with them the mixed or double function. 



The same mixed or double character belongs to the other parts of 

 the reflex function, as that of the larynx, the sphincters, the eja- 

 culators. All the organs of the reflex function are also alike im- 

 pressed through the medium of the mental affections or passions. 



The course of the influence which constitutes the reflex function 

 must be divided into the incident, or that into the medulla, and the 

 reflected, or that from the medulla. The nerves which conduct the 

 incident impression have, liitherto, received no designation ; the 

 others constitute a part of the system of muscular nerves. To the 

 former class belong nerves which doubtless supply the larynx with 

 its impressibility by carbonic acid, &c., &c., and hitherto unde- 

 scribed, untraced ; to the latter, the superior and inferior laryngeals : 

 to the former belong the fifth, in the nostrils, in the face, — the 

 eighth in the lungs, &c. ; to the latter the respiratory nerves : to 

 the former, nerves hitherto undescribed of the sphincters, ejacula- 

 tors, &c. ; to the latter, the muscular nerves supplying these parts. 



The whole constitutes the subject of an investigation in which 

 Dr. Hall has been for some time engaged. 



