PURPUKA ILEMOREHAGICA. 153 



the portions in which it occurs, and a lighter hue to the other 

 parts of muscles; much effusion of lymph in contiguous 

 structures; deposits more extensive in the more quiescent 

 muscles, as the pectorals and psose, if the horse remains 

 quiet ; also, between the coats of that portion of duodenum 

 tied to the capsule of Glisson, terminating abruptly, where it 

 is loosely held by mesentery before crossing the spine ; and 

 also at the pylorus: ecchymoses on the pleura, and in the 

 substance of the lungs ; slight blush in the bladder, and spots 

 of elevated ecchymoses in bladder and ureters, or inflammation 

 and deposits in the coats of the intestines, either in the colon, 

 caecum, or small intestines ; the heart is affected ; deposits of 

 blood, various, upon the cerebrum and cerebellum. 



"Pathology. 1, An increased tenuity of the blood; 2, 

 dilatation of the mouths of the capillaries, admitting natural 

 blood to pass through them ; 3, tenderness of the coats of the 

 vessels, giving way from the ordinary impetus of the blood ; 

 4, increased impetus, rupturing healthy vessels ; 5, obstruction 

 in the capillaries ; 6, two or more of these causes combined. 

 Still, the universality of the disease does not allow of the 

 proper explanation of the phenomena from either of the above 

 causes, and the more rational mode of explaining it seems 

 that which refers to an alteration in the condition and vital 

 properties of the blood. 



"Exciting Causes Pre-disposing Causes. Debility, in- 

 duced by previous inflammatory disease, either severe or 

 mild ; poor living ; frequent irritation ; it occurs, also, with- 

 out any assignable cause. 



"Diagnosis. It can hardly be confounded with other 

 diseases in the horse, melanosis differing so essentially. 



"Prognosis must be guarded, and can only be favourable 

 when the fever has abated when, the swellings are confined 

 to the limbs, not attended with difficulty in motion when 



