DISEASES OF THE RESPIRATORY ORGANS. 139 



be laxative, consisting of scalded oats, oatmeal, or linseed 

 gruel and green food. 



CHRONIC NASAL CATARRH. 



Definition. — A discharge of varying character from the 

 nasal chambers, which may be continuous or irregular. 



Etiology. — Most of the cases of nasal catarrh are due to 

 unhealthy condition of the raucous membrane of the nasal 

 chambers or of the mucous cavities in connection with 

 them, and are the result of protracted and severe cases of 

 acute catarrh. It may arise from other causes, as external 

 injuries, caries of the upper molars, disease of the superior 

 maxillary bone, alveolar abscesses, disease of the facial 

 bones, etc. These latter will be considered under 

 'Surgery.' 



Symptoms. — There is a discharge of a glairy purulent 

 fluid, and the Schneiderian membrane is of a leaden hue, 

 or it may be blanched and thickened with infiltration. 



The general health is generally somewhat impaired. 



Treatment — The animal should be rested, and liberal 

 diet allowed. Salts of iron or arsenic are recommended in- 

 ternally, with or without vegetable tonics. 



Locally, lotions consisting of four or five grains of sulpho- 

 carbolate of zinc, or half a drachm of sulphate of copper 

 to the ounce of water, may be injected up the nostrils by 

 means of an enema syringe or through a Key's nasal funnel. 

 The use of atomised solids is in some instances to be pre- 

 ferred to lotions. 



Iodoform, blown into the nostrils by an insufiiator, is an 

 efficacious remedy. 



