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tinct or can not be lieard. A venous pulse is seen on tlie line of the 

 jugular veins along the neck. Eespiration becomes more difficult and 

 rapid. If the animal is moved the symptoms become more marked, or 

 it may drop suddenly dead from heart failure. 



Peritonitis, or inflammation of the membranes lining the belly and 

 covering the organs contained in it, sometimes takes place. The general 

 symptoms are similar to those of a commencing pericarditis. The local 

 symptoms are those of paio, especially to pressure on side of the flanks 

 and belly ; distension of the latter, and sometimes the formation of flatus 

 or gas, and constipation. 



.Diagnosis.— The diagnosis of influenza is based upon a continued fever, 

 with great depression and symptoms of stupor and coma ; the rapid, 

 dark saffron, ocher, yellowish discoloration of the mucous membranes, 

 swelling of the legs and soft tissues of the genitals. When these symp- 

 toms have lasted for a greater or less time, the diagnosis of the locali- 

 zation of the fever or complication is based upon the same symptoms 

 that are produced in the more local diseases from other causes, but in 

 influenza the local symptoms are frequently masked or even entirely 

 hidden by the intense stupor of the animal, which renders it insensible 

 to pain. The evidence of colic and congestion, which is followed by 

 diarrhea, fills the symptoms for the diagnosis of enteritis. The rapid 

 breathing or difficulty of respiration forms the suspicion at once of com- 

 plication of the lungs, but as we have seen in the study of the symptoms 

 the local evidences of lung lesions are frequently hidden. Again, we 

 have seen that inflammation of the feet or founder complicating influ- 

 enza is frequently not shown on account of the insensibility to pain on 

 the part of the animal, which indicates the importance of running the 

 hand daily over the hoofs to detect any sudden elevation of temperature 

 on their surface. 



The diagnosis of brain trouble is based upon the excessive violence 

 which occurs in the course of the dis ease, for during the intervening 

 period or coma there is no means of determining that it is due to this 

 complication. Severe cases of influenza may simulate anthrax in the 

 horse. In both we have stupor, the intense coloration of the mucous 

 membranes of the eyes and and a certain amount of swelling of the 

 legs and under surface of the belly. The diagnosis here can only be 

 made by microscopic examination of the blood. In strangles, equine 

 variola, and scalma we have an intense red, rosy coloration of the mu- 

 cous membranes, full, tense pulse, and although in these diseases we 

 may have depression, we do not have the stupor and coma, except in 

 severe cases which have lasted for some days. In influenza we have 

 no evidence of the formation of pus on the mucous membranes as we 

 did in the other diseases, except in the conjunctiva of the eyes, where, 

 however, we have had a profuse serous discharge, producing the con- 

 junctivitis. 



In severe pneumonia (lung fever) we may have profound coma, dark 



