DISEASES OF THE INTESTINES. 231 



The first variety may be termed congestive, or indeed 

 ajjopledic, from the rapidity with which the animal is struck 

 down, as it were, and dies in a few hours. Of this variety the 

 causes are not always apparent, but over-exertion, prolonged 

 exposure to cold, drinking cold water when heated, and 

 finally, washing with cold water while the animal is in a 

 heated and perspiring condition, are among the chief which 

 we are acquainted with. 



The second variety, which may be termed secondary en- 

 teritis, is in most instances of not such a severe type, even 

 though the extent of inflammation is in some cases very 

 great. This form depends upon impaction of faeces, consti- 

 pation, intussusception, the ingestion of irritative poisons, 

 especially arsenic, various concretions, aggregations of para- 

 sites, and various other causes. 



In addition to the above causes, enteritis may also super- 

 vene in some fevers and constitutional diseases. As an 

 example may be mentioned the enteritis of pink eye, or 

 pneumo-enteritis, as this form of influenza has been termed. 



By some the caecum and colon are said to be more fre- 

 quently invaded than the small intestines, while other 

 authorities affirm that enteritis has its seat more frequently 

 in the ileum and jejunum. 



Symptoms. — In some cases the symptoms of enteritis are 

 gradual, while in others they are sudden in their onset. Not 

 unfrequently the abdominal pain is preceded by general con- 

 stitutional disturbance, shown by acceleration of the breath- 

 ing, marked dulness, depression, and loss of appetite ; while 

 in other instances the inflammatory action is ushered in with 

 marked shivering or rigors. 



The belly is generally tender when pressure is applied. 



The abdominal pain, unlike that of colic, is continuous, is 

 more agonizing, and rarely has periods of intermission. 



The pulse, at first quick, hard, and wiry, becomes in the 



