PATHOLOGY. 21 



II. F^ATHOLOG^Y. 



This branch of our subject we propose to consider under 

 the ordinary classification of Descriptive (A) and General 

 (B), designing further to subdivide the former by treating 

 first of the sym])toms (A 1,) or descriptive appearance of the 

 disease as it is manifested in the infected animal before 

 recovery or death, and next of the morMd anatomy (A 2), or 

 description of the lesions revealed by post mortem dissections. 



In a few cases, taken from Jessen's Eeport {BericM l7np- 



fungen cler Einderpest) on the results of the inoculative 

 methods, we have for convenience given the symptoms and 

 2)ost mortem revelations conjointly. Further historical ref- 

 erence to other murrains, and the consideration of their 

 destructive characteristics as compared with the Pest, will be 

 reserved for the general discussion. 



As we derive our knowledge of the symptoms and morbid 

 anatomy of this distemper from authorities recognized as 

 such in England and on the continent, of whom we may 

 enumerate Smart, Wood, Simonds, A. & J. Gamgee, Simon, 

 Pope, Gerlach, Egan and Jessen ; where there are con- 

 flicting or independent statements, we will subjoin to such 

 the name of each authority. 



(A 1.) SYMPTOMS. 

 These will be arranged after the following classification 

 of the several stages or periods of the disease : 1st. Incuba- 

 tion; 2d, External symptoms; 3d. The Congestive Period; 

 and 4th. That of Eesolution. 



1st Incubation. 

 From the time of the first introduction of the poison into 

 the system, until the development of the external symptoms, 

 a period elapses of several days, which is known as the incu- 

 bative stage of the disease. The time assigned by different 

 authorities varies considerably^ though there is but little doubt 

 that we may fix this period in the majority of cases as one of 

 six days. This is the time assigned by Smart and Wood. 

 Egan states it from four to eight days. (2d Eep., p. 79.) 



