18 DISEASES OF SHEEP. 



increased warmth, by which the textures become extended. 

 There is always a difference in the degree of the swelling, 

 which varies according to the intensity of the inflammation, 

 or according to the place or structure of the aflfected parts. 



IV. Pains. Every inflamed part possesses a greater ir- 

 ritability than in its healthy state, although not always in the 

 same degree. The intensity and duration of the inflamma- 

 tion, the place and constitution of the inflamed part, and 

 particularly the presence of a larger or smaller number of 

 nerves, are the causes of as many differences in the degree 

 of such irritability. Besides this, it must be taken into 

 consideration whether the affected part in its healthy state 

 is more or loss irritable and sensitive. For instance, inflam- 

 mation of the eye is generally very painful, inasmuch as the 

 organ in its healthy condition is very delicate and sensitive ; 

 inflammation of the stomach is extremely painful, because the 

 stomach contains numerous and very large nerves ; whereas 

 inflammation of the lungs and heart does not cause such 

 intense pain, because both these parts contain very few 

 nerves. The inflammation of loosely-constructed or spongy 

 parts, which easily enlarge, is generally less painful than 

 that of those parts which are more compact and not so 

 liable to extend. Often we perceive the pain only after 

 pressing the inflamed part, as, for instance, in inflammaticm 

 of the throat. When inflammation of the brains occurs, the 

 eye becomes red and fixed or staring, and inflammation of 

 the eye causes pain to the eyes even in daylight. Whenever 

 the lungs, to which air is most important, are afflicted with 

 inflammation, the introduction of cool air causes a cough, 

 which in a healthy condition would not occur : the lungs 

 are therefore most liable to irritation and pain. 



V. Disturbed Functions. Whenever any part of the 

 body is inflamed, the natural functions of that part are 

 more or less changed, disturbed, or destro3'ed. The know- 



