80 VETERINABY MEDICINE AND SURGERY. 



ROARING. 



Definition^. — Eoaring is a very peculiar noise made usually in the act 

 of inspiration, especially when the breathing is accelerated. In some 

 cases it may be made both in expiration and inspiration. The sound is 

 caused by obstruction in some part of the respiratory passages, and usu- 

 ally in the larynx. 



Etiology. — Roaring is said to be due to paralysis and fatty degene- 

 ration of the muscles of the larynx; by some author? considered to be 

 chiefly hereditary. There is considerable doubt concerning the existence 

 of this cause. Among other causes are: Diseases of the nose; nasal 

 polypi; depression of the nasal bones from previous fracture; osseous 

 tumors in the nostrils; closing of one nasal chamber by false membrane 

 or disease of the bones; tumors on the posterior nares, called " bellones," 

 falling into the glottidean opening, causing intermitting roaring; con- 

 stricting of the trachea; tumors in the thoracic cavity; distention of the 

 gutteral pouches; disease of the pharyngeal and parotidean lymphatic 

 and salivary glands; tight reining; fractures of the tracheal rings, or any 

 cause of distortion of the larynx. 



Treatment. — The treatment to be adopted, and the chance of a suc- 

 cessful result in any particular case, must depend on the cause of the 

 disease, and its being taken in treatment early. A confirmed roarer 

 cannot be cured. 



As, however, in broken wind and chronic cough, good food and regu- 

 lar work, with high condition, exercise a favorable influence, and may 

 for a length of time render a roarer useful for many purposes; but with 

 all our care the disease, when arising from the above causes, generally 

 increases until the animal becomes useless. 



If the roaring proceeds from a tumor in the nose, it may be jDOssible 

 to remove it. If it be caused by an obstruction in the air tube, arising 

 from an injury or from the effect of an operation, it is possible that re- 

 lief may be obtained by the application of a blister of: 



Biniodide of mercury . . 1 part 



Lard 8 parts 



Bands of organized lymph across the trachea, or a band of that material 



