EXPLANATION OF PLATE I. 



Represents a transverse perpendicular section through the base 

 of the cranium, and between the pharynx and cervical vertebrae. 

 The pharynx is laid open and exposes posteriorly the nares, velum, 

 uvula, base of the tongue and glottis, with the left forefinger applied 

 upon the epiglottis and pressing it forwards against the base of the 

 tongue; the curved knife is placed with its cutting extremity in the 

 entrance of the glottis between its edges, which are represented as 

 oedematous. 



