PUEPURA H^MOERHAGICA. 383 



In other instances, effusion poured out into tlie lungs is con- 

 verted into a fibrinous exudate, which tends ratlier to a retrograde 

 metamorphosis than to organisation, forming a caseous or semi- 

 caseous mass, and interfering most materially not only with the 

 integrity of the organ, but with the general health of the horse. 



The more particular symptoms are petechial spots, of a dull 

 mulberry or purple hue, on the visible mucous membranes. 

 There is very often haemorrhage from the mucous surfaces, the 

 discharged blood being dark in colour and often foetid in odour. 

 Extravasations also occur in the substance of several viscera, 

 more particularly the lungs, spleen, and liver. The limbs, lips, 

 and other depending parts of the body swell, the swelling aris- 

 ing from extravasation of blood into the areolar tissue, and from 

 the transudation of serum, and feebly coagulable lymph. The 

 swellings are characteristic : they are generally uniform, extend- 

 ing perhaps the whole length of a limb, and terminating superiorly 

 very abruptly, as if a cord had been drawn around the part. 

 They are painful, hot, hard, and in those portions where the 

 skin is barely covered with hair, as the lips, nostrils, and inside 

 of the thighs, shining; and if uncoloured, petechial spots are 

 seen upon its surface, but where it is dark-coloured no spots 

 are discernible. Vesicles of about the size of a pea are present 

 upon the lower parts of the limbs, around the hock and fet- 

 lock joints ; these burst and discharge an amber-coloured acrid 

 serosity that scalds and excoriates the surface of the skin 

 over which it flows. Cracks and fissures appear at the 

 flexures of the limbs, from which an unhealthy amber or 

 purple coloured discharge issues. Swellings appear about the 

 sheath, abdomen, and breast ; these, in the earlier stages often 

 disappear from one part of the body and reappear in another. 

 In many instance the face, lips, nostrils, and eyelids become 

 fearfully swollen ; the swelling being tense, uniform, and end- 

 ing abruptly about the forehead. This swelling of the head 

 is apt to cause a fatal termination by interfering with the 

 respiratory function ; the swollen nostrils diminishing the calibre 

 of the nares, great dyspnoea is thus induced. By interfering 

 with the movements of the tongue and jaws it also prevents the 

 animal from feeding, and thus becomes an additional cause of 

 debility. The skin over the swollen parts has a great tendency 

 to slough, leaving large open and unhealthy looking sores, wliich 



