172 



VETERI NARY PATHOLOGY. 



flammation are not distinctly separable although the former is 

 usually milder than the latter. Typical croupous exudate may 

 be detached withdut serious injury to the surface tissue but 

 the diphtheritic exudate cannot be removed without detaching 

 or extensi\"elv lacerating the surface tissue. Croupous pneu- 

 monia and croupous enteritis are examples of crou])ous inflam- 

 mation, the former l.x-ing the most frequent t}-pe of pneumonia 

 in horses and the latter occurring occasionally in cattle. Roup 

 or ayian diphtheria, and diphtheritic stomatitis and enteritis are 

 examples of diphtheritic inflammation, the former being com- 

 mon in fowls the latter in pigs. Fibrinous exudate may be 

 present in inflammatit)n of serous membranes, constituting 

 fibrinous pleurisy, peritonitis, etc. 



(c) Hemorrhagic inflammation is significant of the action of 

 an e.xtreme irritant. Hemorrhagic exudate coagulates, especially 

 uiKin surfaces, though it may coagulate within a tissue. Inflam- 

 mation of tissues in which the blood yessels are (if meager struc- 

 trure (capillaries), and hence easily permeated or ru])tured, is fre- 

 (|ucntl\- of this type. Croupous pneumonia is a hemorrhagic in- 

 flanmiation. Nephritis and hepatitis are frecjuently accom- 

 panied by a hemorrhagic exudate. 



(Mucus and pus haye been described as inflammatory exu- 

 dates by some and as inflammatory products by others.) They 











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O^l" 



Fig. 103. — Heniorrllasic Exudate (Red Hepatization.) 



