52 Veterinary Medicine. 



Blood Exudations. In all inflammations tliere is some mi- 

 gration of blood globules (red as well as white) but seldom in 

 quantity sufficient to stain the tissues materially. Minute ruptures 

 of the capillary vessels are not uncommon, with punctiform clots 

 in the tissues, but extensive escape of blood is mainly seen in 

 penetrating or contused wounds of the loose, subcutaneous con- 

 nective tissue, and in infective inflammations (anthrax. Rinder- 

 pest, swine plague, petechial fever, malignant catarrh, snake- 

 bites) with destruction of blood globules or extreme changes in 

 the walls of the capillaries. Newly formed vessels in friable neo- 

 plasm are subject to blood effusions. In acute inflammations of 

 serous membranes the exudate is usually of a dark port wine hue 

 at first. In such cases it may pass in succession through all the 

 stages of dark red, brick red, yellow, reddish, and chocolate color, 

 before becoming milky and finally transpareut. 



Croupous Exudate. Croupous inflammation usually occurs on 

 or near a mucous surface and is characterized by an exudation 

 consisting mainly of fibrinous material entangling white cells, 

 epithelium, a few pus corpuscles and some form of bacteria. In 

 true diphtheria of children this is the Lofiler bacillus, in the pseudo- 

 diphtheria, attending on scarlatina, etc. , it is streptococcus pyoge- 

 nus, in the diphtheria of calves it is bacillus diphtherias vitulorum, 

 and in that of chickens and pigeons it is the bacillus diphtherise col- 

 umbarum (Loffler). Pseudomembranous inflammations therefore 

 constitute a group agreeing in the nature of the exudate but 

 differing essentially in the cause. This difference in the cause 

 has a most material effect on the course and gravity of the disease. 

 One form like true diphtheria in man not only extends into the 

 tissues, and tends to necrotic changes, but also poisons the nerve 

 centres by the toxic materials absorbed inducing troublesome 

 paralysis, while another like croup of children establishes a vio- 

 lent but essentially superficial disease and when that recovers it 

 leaves no ulterior ill effects elsewhere. 



A Chyliform exudate has been noted in peritonitis in the dog 

 the milky whiteness being due to fatty granules. 



RBSULTS AND PRODUCTS OP INFI<AMMATI0N. 



As nearly all inflammations have significant exudations it is 

 well to follow these in their subsequent progress through reab- 



