118 DISEASES OF THE BESPIBATORY ORGANS 



best, as it lessens the cough and irritation. The following pre- 

 scription is very useful where the animal is a small pet dog — that 

 is, kept in the room ; it is very useful to prevent the cough, as it 

 is always worse at night: 



B. — Morphise sulph 0-1 



Aq. amygdalae amarse ... . . 24.0 



S. — Half a teaspoonful three times daily. 



R. — MorpMsB sulph 0.12 



Potassii cyanid. . . . . . 0.15 



Syr. pruni Virgin. .... .96.00 



S. — One teaspoonful four times daily. 



R. — Ext. hyoscyamus 1-0 



Liq. ammon. acetatis 20.0 



S. — Twenty drops every half hour. 



Chronic Catarrh of the Larynx. 

 (^ChroniG Laryngitis ; Convulsive Cough; Chronic Irritable Cough.) 



Etiology. Chronic laryngitis generally results from an acute 

 attack of laryngitis or from some severe irritation of some of the 

 other organs of the air-passages ; it generally comes on gradually, 

 the cough getting more frequent; it may also follow ulceration of 

 the larynx or the formation of a tumor in that part. 



Pathological Anatomy. The mucous membrane is thick- 

 ened, but not so red as in acute laryngitis ; it is marked with 

 fissures and elevations from enlarged tissue; and here and there 

 may be noticed a dirty bluish-red coloration. The surface is gran- 

 ular on account of the swelling of the inflamed mucous glands ; in 

 rare cases we may see small papilliform elevations or small eroded 

 ulcerative places which mark a breaking down of some of the 

 mucous glands ; the secretion which covers the parts is thick, slimy, 

 and tenacious ; in some cases it is yellow, like pus. 



Clinical Symptoms. The symptoms are similar to acute 

 laryngitis, except that they are not so severe; the larynx is slightly 

 sensitive to pressure; still the irritation is there; the animals will 

 cough after manipulation, but not to such a marked degree ; they 

 do not try to get away from the pressure as they do in the acute 

 form ; there is no disturbance of the general system. The cough 

 sounds dry, hoarse, and rough, seldom moist ; the cough, which is 



