30 TUE TONER LECTURES. 



reported by Mohr' and Laemiec,' the knowledge of which 

 should guard us against a similar error. The operation having 

 been apparently achieved and tlie canula inserted, respiration 

 was not bettered nor did air pass through the canula. In a 

 few minutes the pj^tients died suffocated. At the post-mortem 

 it was found that the canula liad entered, not the larynx, but 

 the abscess around the cricoid. In Mohr's case the vertebrai 

 were felt through the incision, and a probe and the canula 

 moved freely about in wliat was naturally believed to be the 

 trachea but proved to be the abscess cavity.^ 



In three cases' of oedema the canula was removed in six, eiglit, 

 and nine days respectively. But after such serious loss of 

 substance and extensive organic mischief as are involved in 

 the cases of perichondritis, it is not a matter of wonder that 

 the stenosis of the larynx is generallj'^ permanent. In It cases 

 of probable or actual perichondritis, the canula was removetl 

 in one case after seven months, but in the other 16 cases, when 

 last seen, the patients were still wearing them. Once, after 

 seven 3'ears' use, a piece of the canula wore away, broke off, 

 and fell into the trachea, whence it was successfully removed 

 by Albers. Busch, Russell, and others have attempted to 

 dilate the stricture, both from above and below, but without 

 any success.* 



' Casper's Wochenschr., 1842, p. 192. Also in Dittrich, Pmg. Yier- 

 teljahr., 1850, iii. p. 129. 



2 Bayle, Nouveau Journ., t. iv. p. 37. 



3 Green, Brit. Med. Journ., Dec. 17, 1870, p. 649. and Marsh, St. Barth. 

 IIosp. Reports, iii. 368, report cases (not following fevers, however) in 

 wliich the tube was inserted in the cellular tissue in front of the trachea. 



■* By the courtesy of Drs. Otis and Woodward, of the Army Medical 

 Ituseum. the casts and specimens of Dr. Buck's case, p. 18, and of 

 several cases of laryngeal stenosis, were shown. 



