122 CLINICAL DIAGNOSTICS. 



This is most marked in dogs. In rabies the voice suffers 

 change. In dogs affected with this disease the bark is pro- 

 longed into a long, dismal howl, the voice being at the same 

 time hoarse. In horses a short, squealing tone is emitted. 



VIII. The Larynx and Trachea. 



Inspection. Enlargements in the region of the larynx 

 are as a rule not confined to this organ, but to neighboring 

 tissues as the pharynx, lymph glands, subcutis. 



In birds the larynx may be inspected by simply opening 

 the bill and pressing the larynx upwardly. In dogs and cats, 

 and to a more limited extent in goats and sheep a view of the 

 larynx may be obtained by opening the mouth and drawing the 

 tongue forward. 



Laryngoscopy. 



With the aid of the laryngoscope invented by Polansky 

 and Schindelka, the interior of the larynx may be examined 

 directly. For the diagnosis of inflammatory conditions in the 

 larynx this examination is of no practical value. However, 



Fig. 31. 

 View of the larynx with paralysis of the left side, as seen through the laryngoscope. 



