82 Veterinary Medicine. 



and vigorous, and the changes of the coat in spring and autumn 

 prove strong predisposing causes. Nervous causes are potent in 

 causing engorgement of the erectile tissue covering the turbinated 

 bones, and local irritants, like septic dust, lime, ipecacuanha, pollen 

 of certain plants, smoke, and irritating fogs may precipitate it. 

 Iodine in large doses produces temporary catarrh. The weakness 

 of the mucosa from a previous attack predisposes to a second. 

 Occasionally the disease sweeps over a country, as.suming the 

 form of an epizootic when it may perhaps be preferably con- 

 sidered as a catarrhal fever, strangles or mild type of injlueiiza, 

 which see. 



Symptoms. \\\W\q. milder forms oi coryza the symptoms may 

 be almost exclusively local, consisting in redness and dryness of 

 the membrane lining the nose and sneezing, .soon followed by the 

 bilateral discharge of a thin transparent watery liquid, succeeded 

 by a turbid flow (epithelial cells in excess) and after two or three 

 days by a thick, white, flocculent, puriform fluid (suppuration 

 diapedesis). With the supervention of the purulent discharge, 

 comes an abatement of the local inflammation and the freer the 

 discharge the greater usually is the relief obtained and the more 

 rapid the recovery. The eyes are usually red' and watery and 

 sometimes the eyelids are swollen. This implies the continuity 

 of the inflammation through the lachrymo-nasal duct, and the 

 obstruction to the flow of tears into the nose. 



When constitictional disturbance exists a rough or staring coat 

 appears as one of the first symptoms, the sneezing is more violent, 

 the nasal mucous membrane is more reddened and swollen, the 

 eyes more dull, sunken and watery, the mouth hot and clammy, 

 the tempei'ature of the body raised, the pulse more frequent and 

 having a sharper beat, the impulse of the heart may often be felt by 

 applying the hand to the chest just behind the left elbow, the ap- 

 petite is fastidious and the secretions of the bowels and icidneys are 

 diminished, the latter being denser and more highly colored, from 

 the absorption of irritating or infecting matters the glands under the 

 throat are swollen and the swelling of the mucous membrane may 

 be such as to impair breathing and even to threaten suffocation. 

 In severe cases in which the inflammation extends to the nasal 

 sinuses there is heat and tenderness over the forehead and the 

 pain and weight are manifested by the pendent head and the red 



