IMLAM MATION. 1/1 



results from rapid, active suppuration, as sulMiiaxillary a1)scesscs 

 in strangles, while the so-called cold al)scess results from a slow 

 suppurati\'e process, as in tuberculosis. Accumulations of pus 

 in body cavities as the peritoneal, pleural, pericardial, synovial 

 and the facial sinuses constitute empvema. Vesicles may be- 

 come infiltrated with leucocytes, which become pus cells, and 

 thus the vesicle becomes a pustule. 



Diffuse sup|)uration is not limited bv an\- definite Ixirder line. 

 It is the result of a,i;encies possessing sufficient strength or 

 virulency to continuouslv and progressively destroy- and lif|nefy 

 tissue or it occurs at a time when the resistance of the animal 

 or its tissues is so greatly tliminished that there is inability to 

 successfully antagonize the causative agent. Purulent infiltra- 

 tion is the permeation of tissues with pus. I'hlegmonous in- 

 flammation is the rapid and usualh- e.xtensi\'e infiltration of 

 tissues with leucocytes (pus cells), and occurs most frequently 

 in the subcutcm and submucosa. 



lixitdatc. — .\ccording to the nature of the exudate inllamniation 

 tion ma\- be classified as serous, fibrinous, and hemorrhagic. 

 The physical pToperties, cheiuic and histologic composition of 

 inflammator\ exudate has been previously discussed. 



(a) Serous inflammation is characterized bv a serous exudate. 

 Infiammation of serous membranes and infiammatorv disturb- 

 ances of other tissues than serous membranes, caused by mild 

 irritation, mav lie of this type. ( )ccasionan\' serous inflanuna- 

 tion is the result of intense irritation as in malignant oedema. 

 Tlie terms serous inflamuiation and infiannuation of serous 

 membranes should not be used interchangeablv, because in- 

 flammation of serous membranes mav be characterized bv 

 fibrinrius or hemorrhagic exudate. .\ circumscribed accumula- 

 tion of inflamniator\' serous fluid (exudate) in the deeper lay- 

 ers of the e])ideriuis or mucosa constitute a vesicle. Inflam- 

 matory oedema, a serous inflammation, is the condition result- 

 ing from the diffusion of an excessive amount of inflannnatory 

 serous exudate into tissues as in cellulitis ( inflammatirm of 

 sub-cutem). 



(b) h'ibrinous inflammation designates tliat ty])e of inflammatory 

 disturbances in which there is produced a coagulable exudate. 

 The exudate may coagulate within the tissues or upon the tis- 

 sue surface. Croupous inflammation is the term applied to the 

 condition resulting from the coagulation of the exudate upon a 

 tissue surface. Diphtheritic inflammation is the condition pro- 

 duced bv coagulation of the exudate within the tissue and 

 upon its surface. Croupous inflammation and di]ihtheritic in 



