22 



THE TONER LECTURES. 



(38 times), next the arytenoids (19 times), while the other car- 

 tilages were affected but 5 times. In 10 of the cases, the 

 cricoid and arytenoid were involved simultaneously. 



Fig. 3. 



Perichondritis laryngea following typhoid. Ulcers on the posterior wall of the 

 larynx. At a, a piece of the necrosed left arytenoid cartilage shows. Tiirck, 

 Krankh. des Kehlkopfes, p. 21(5, fig. 78. 



It is to be specially observed that probably a number of the 

 cases which recovered w^ere also really cases of perichondritis, 

 of which the positive evidence was wanting. Thus, in 8 cases 

 in which recovery followed tracheotomy, the patients spat up 

 gangrenous or purulent matter, besides having other symptoms 

 of cricoid necrosis ; but as the expectoration of any pieces of 

 necrosed cartilage was not positively observed, I have not 

 included them in my statistics of necrosis. Were they in- 

 cluded, the result, and especially the result after tracheotom}-, 

 would be far more favorable. 



Whatever the origin of the necrosis, the cartilage is soon 

 destro^^ed, either by molecular disintegration or is even broken 

 in pieces. Sometimes it undergoes ossification ; at others, 



