MALIGNANT CORYZA. 541 



Oxen and young cows are chiefly subject to the disease, old 

 cows rarely. 



Symptoms. The premonitory signs consist chiefly in 

 diarrhoea, the eyes are red, dull, dry, and the head hot. 

 Dulness, sunken head, a shivering fit, followed by heat, dry 

 muzzle, hot mouth, salivation, discharge of tears and swollen 

 eyes, with intolerance of light, and even turbidity of the 

 aqueous humour, are all symptoms of the early stage. The 

 mucous membranes are of a blueish-red colour, pulse fre- 

 quent and full, heart's action feeble, breathing accelerated, 

 and painful cough. There is much thirst, urine high coloured, 

 and faeces black and hard. 



In the second stage, which appears about twenty-four 

 hours after the first indication of illness, the catarrhal symp- 

 toms are fully developed, the discharge is ichorous and mixed 

 with blood, and accumulations of pus occur in the nasal 

 sinuses, over which there is much heat. There is dulness 

 on percussion over the frontal sinuses; red patches develope 

 in the mouth, and the cuticle over them falls off. The ap- 

 petite is totally lost ; the discharge of fseces and urine is 

 attended with pain, and there are pains in the extremities, 

 indicated by lameness, &c. Pregnant cows have a great 

 tendency to abort. 



In the third, or nervous, stage there is an increase in the 

 nasal discharge, sloughing of the schneiderian membrane, 

 and of the secreting structures of the horns, and also some- 

 times of the hoofs. The horns and even the hoofs drop 

 off. Convulsions and symptoms of apncea immediately 

 precede death. Near Berlin, in 1854, false membranes 

 were found to form on the mucous membrane of the mouth 

 and respiratory passages, with ulcerations of the conjunc- 

 tiva. 



After death the signs of lesions mentioned under the head 



