60 INFLUENZA. 



from those which will be noticed when we come to discuss 

 common inflammatory processes in these same structures. 



All cases of this character do not terminate favourably by 

 the steady removal of the diseased products, for succeeding a 

 time, probably several days, of not only apparent but actual 

 convalescence, we have in these cases of pulmonic complica- 

 tion a reappearance of pyrexia, which may continue for some 

 time, and is always very liable to terminate fatally. The 

 period of the appearance of this secondary fever seems to coin- 

 cide with the removal by absorption of the effused and changed 

 products of the inflammatory action, which if not removed 

 from the system by the ordinary processes of secretion and 

 elimination, on retention produce poisoning of the blood, 

 inducing hectic fever, and in some instances disseminated 

 abscesses and pyjemia. 



These abscesses are most apt to occur in connection with 

 the lymph glands on the tract of the larger absorbents in the 

 vicinity of organs and particular structures which have been 

 marked as the special seats for the manifestations of the 

 speciftc action of the infecting virus. 



3. Abdominal, Intestinal-Catarrhal, or Enteric Form or Com- 

 plications. — The thoracic, or pulmonary form of influenza, 

 which has now been lightly sketched, is very frequently, even 

 from the development of its primary symptoms, more par- 

 ticularly independent of the usual and uncomplicated catarrhal 

 form or fever than any other of its recognised types ; that is to 

 say, the illness is in many instances found to start with the 

 positive appearance of chest symptoms, and to persistently 

 exhibit these during the entire course of the disease, no 

 premonitory fever being observable. 



In the enteric form, or where the abdominal and enteric 

 complications are so marked and occupy such a prominent 

 position and determining influence on the character, course, and 

 termination of the disease as to warrant us in using these as a 

 distinctive appellation, we more rarely find that they appear 

 or are developed in the earliest stages of the disease. 



In some seasons, in certain districts and amongst a particular 

 class of horses, the enteric features of the disease are so dis- 

 tinctive and so regular in their appearance, as well as possess 

 such a dcterminintj: influence on the ultimate results, together 



