30 DISEASES OF THE LARYNX 



glycoheroin (1- to 2-oz. doses' three times daily) is of service. 

 Very popular is "Equine Cough Syrup" (Parke, Davis & Co.). 

 The following prescription is effectual in horse practice: 



If — Heroini hydrochloridi . . . gr. viij 



Potassii acetatis . . 5 n J 



Tinot. aconiti . . 3iv 



Spiritus setheris nitrosi . Biv 



Syrupi . . . . . q. s. Oj ' 



M. Sig. — An ounce every two hours for cough and fever in horse. 



For expectorant powders which may be used see Bronchitis. 



Chronic laryngitis in large animals may be treated by 

 intralaryngeal injections through the cricotracheal liga- 

 ment, using a special curved hollow needle. Usually 1 oz. 

 of the following solutions is used: 0.5 per cent, acetate of 

 lead, 0.1 per cent, nitrate of silver, 0.5 per cent, alum., The 

 bowels should be kept open by administering Carlsbad 

 salts. 



Obviously in secondary laryngitis accompanying con- 

 tagious diseases the separation of the sick from the healthy, 

 and a thorough disinfection of the premises should be 

 enforced. 



Croupous Laryngitis (Membranous Laryngitis). — Defini- 

 tion. — A form of laryngitis characterized by the development 

 of a fibrinous pseudomembrane on the laryngeal mucosa. 

 Usually the pharynx and trachea are also involved. 



Occurrence. — This is a rather rare disease occurring 

 primarily in sheep and cattle and more rarely in horses and 

 swine. 



Etiology. — Croupous laryngitis may be either primary or 

 secondary. Primary cases result from the inhalation of 

 irritant gases, smoke, heated air, etc. Occasionally following 

 a stable fire or the use of strong irritant disinfectants cases 

 occur. Sheep driven through deep dust to increase the 

 weight of the wool are sometimes attacked. The exciting 

 cause, however, is evidently infection with probably , the 

 necrosis bacillus or streptococci. 



Secondarily, croupous laryngitis is a symptom of malig- 

 nant head catarrh, necrotic stomatitis of calves, purpura, 

 glanders (acute), rinderpest, etc. 



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