236 DISEASES OF POULTRY. 



remain upon the premises for several weeks or 

 months. 



Postmortem Appearances. — The comb is pale 

 and bloodless, but neither dark nor dark blue, as it 

 has often been described, particularly in Europe. The 

 superficial blood vessels generally contain but little 

 blood, and there are in most cases soiled feathers about 

 the anus, to which the excrement may adhere" in con- 

 siderable quantity. , 



The liver in nearly every case is enormously en- 

 larged, softened, with blood vessels very apparent, 

 often of a very dark or dark -green color. The gall 

 bladder is distended with thick, dark bile. 



The crop is generally distended with food, though 

 no special lesions have been noticed here The stom- 

 ach, viewed externally, often presents a number of 

 circular discolorations about one -tenth of an inch in 

 diameter, which on section are found to be small clots 

 of extravasated blood. The small intestines are con- 

 gested. 



The rectum and cloaca generally present deep red 

 lines upon their mucous membrane, evidently the first 

 stage of inflammation, which results, in chronic cases, 

 in thickening of the walls, especially of the rectum, 

 the desquamation of the mucous membrane, and the 

 formation of large ulcerous surfaces. 



The mesentery is generally congested, often greatly 

 thickened and rendered opaque by inflammation. The 

 ureters are distended with yellow urates ; the kidneys 

 seem engorged, and on section accumulations of the 

 tenacious, yellow urates are frequently seen. The 

 spleen is generally normal in size and appearance, 

 though frequently enlarged and softened. 



The pericardium is sometimes distended with effu- 



