19 



Each exhibits a peculiar plan of morbid process. 



Each depends upon a peculiar cause. 



The effects of said cause are irrespective of its quantity 



or extent. 

 They are diffusible from one part of the body to another. 

 They exhibit different stages of the morbid process. 

 Some of these, as rheumatism, is self-limited (dying out). 

 Chronic inflammation. — In this form of inflammation 

 there is more or less redness, heat, swelling, and pain ; yet 

 they are wanting in exudation, without which (pathologically) 

 there is no inflammation. 



The characteristics of this state are: 



1. Enlargement of the blood vessels of, a part with the 



flow of a large amount of blood through it. 



2. Exaggeration of the sensibility of the part, and mor- 



bid irritability. 



3. Deficient or irregular functional power. 



4. Unusual proneness to acute or sub-acute attacks of 



actual inflammation. 



PATHOLOGY OF THE NERVOUS SYSTEM. 



For the purpose of pathological study, we must remember 

 that the anatomical elements of the nervous apparatus are — 



1. Grey vesicular. 



2. White, tubular nervous substance; the former 

 being arranged in ganglia, the latter in nerves and commis- 

 sures. 



Physiologically, the functions of the ganglia (nerve 

 centres) are to receive, reflect, accumulate (generate) and 

 distribute nerve force. The sole function of the nerves and 

 commissures is to transmit or conduct it. 



As a whole, we may state the offices of the nervous 

 apparatus to be as follows : 



Excito-motor. 



Excito-secretory. 



Sensory. 



Voluntary motor. 



Sympathetic, and 



Co-ordinate. 

 And in man — 



Intellectual. 



Emotional. 

 The primary disorders to which this apparatus is 



