DESCRIPTION OF THE PLATE. 



Posterior view of the larynx of a horse which had been 

 seriously afEected with Roaring, showing the alterations 

 generally observed on the left side of that organ. 



a. Epiglottis somewhat deviated to the left side. b. Summit 

 of left arytsenoid cartilage, which, with its body, c, is depressed ; 

 in marked contrast to the right arytenoid cartilage, e f, which 

 is in its normal position, d. Remains of the left dilator 

 muscle of the larynx (posterior crico-arytaanoideus) ; all the 

 muscular tissue has disappeared, and in its place there is 

 only a little fat and fibrous tissue, g. The right dilator 

 muscle of the larynx in a healthy condition, as is also the right 

 arytsenoid muscle, /, while the left is only represented by a 

 few muscular fibres at c. 



In a healthy larynx, the left side has the same appearance 

 as the right. 



