64 INFLUENZA. 



Norway, and Scotland. I have encountered it oftener amongst 

 the coarser breeds of horses, or where the temperament was 

 lymphatic, and where much connective tissue existed in con- 

 nection with the limbs. 



When the true rheumatic features become added to the 

 ordinary catarrhal, there is usually an augmentation in the 

 severity of the constitutional disturbance ; the pulse becomes 

 more frequent, firm, and incompressible, with tumultuous action 

 of the heart ; indeed, cardiac involvement, or complication in 

 the course of the progress of this form, is rather common. 



Now, although these different manifestations of influenza 

 which have been described, in respect of the chief features and 

 symptoms of their appearance and development, are the usual 

 and prevailing forms or types of the fever, and although each 

 of these may be encountered tolerably free and sufficiently 

 distinct to entitle it to its distinguishing name, as such has 

 been defined and restricted, it ought at the same time to be 

 borne in mind that many outbreaks or manifestations of the 

 disease may be seen where the true character would be best 

 described as a compound of two or more of these. 



General Anatomical Characters of Influenza. 



The organic lesions visible on making an after-death examina- 

 tion of cases of influenza are always and in every instance of 

 more than merely passing interest. Here we have always to 

 deal with the diversity of form or type, and in a less degree 

 with that of individual cases. We must also recollect that it is 

 only from comparison of observations as carried out over a 

 number of individual instances that we are capable of, or in a 

 position to form, generalizations. 



The organic changes which we meet with on examination 

 after death vary in accordance with the type or form which 

 the fever may have assumed during life, and consequently of 

 the class of organs involved. 



The extent, characteristic features, and distinctiveness of 

 structural changes, may also vary in accordance with the mere 

 severity of the disease, Avhatevcr may have been its form, with 

 the amount or virulence of the infecting or contaminating 

 agent, whatever that may be, and with the time occupied in 

 the production or completion of the lesions obsei-ved. 



