103 DISEASES OF THE GREYHOUND. 



the lungs the dog has not, at first, these symptoms, but appears 

 well and hearty in himself, though breathing with pain and 

 difficulty, and with a rapid and powerful pulse. Now the signs of 

 inflammation, wherever seated, are the same, namely, increased 

 heat and redness, swelling and pain but the proportions of these 

 symptoms to one another vary considerably, and in some cases one 

 or other may be almost totally absent. The heat exceeds that of 

 the surrounding parts, but is never higher than that of the blood. 

 The redness is caused by the greater supply of red blood than 

 usual, in the minute vessels especially. The swelling is owing to 

 the same cause, and, in addition, to the effusion of some product 

 of the blood into the cellular membrane ; and the pain is due to 

 the pressure of the swelled adjacent parts upon the minute nerves, 

 especially when circumscribed by unyielding walls, as is the case 

 in the chest and skull. The effusion varies according to the 

 structure of the part inflamed and for this purpose it is well 

 to divide the whole body into, first, the glandular system, as the 

 liver, kidneys, brain, &c. ; secondly, the membranous system, 

 again subdivided into the mucous (including its continuation the 

 skin), serous, and cellular membranes ; and thirdly, the fibrous 

 system, including the muscular and ligamentous tissues. In- 

 flammation of the glandular system ends either by what is called 

 resolution, which is merely disappearance, or by the effusion of 

 pus, or by softening. In inflammation of mucous membrane 

 there may be merely an excess of the ordinary secretion of mucus, 

 or there may be pus or fibrine thrown out, sometimes attended 

 with ulceration and gangrene, or in the skin there may be an 



