IXODIC ANAEMIA — TEXAS TEYEU, ETC. 



419 



organ varies, according to the stage of the disease in which 

 the animal dies, the more rapid the fatal termination the larger 

 the spleen. Generally it is from two to four times its natural 

 weight, distended, firm to the touch, its capsule attenuated, the 

 pulp dark brown, glistening, and homogeneous. The markings of 

 the Malpighian bodies and of the trabecular have disappeared. 

 The liver is gravely altered, enlarged, sometimes of a dark 



Fig. 23. 



Micro- Parasites seen as minute points, observed in the mild form of 

 the disease. 



colour from blood congestion, or light coloured from extreme 

 l)ile engorgement ; gall bladder full of thick grumous bile ; when 

 incised the cut surface presents a uniformly brownish-yellow 

 colour, or else a mottled appearance, also seen on the surface. 

 There is occlusion of the biliary canaliculi and ducts, and a 

 more or less extensive fatty degeneration of the liver cells, and 

 a tendency to necrosis of the inner zone of the lobules. 



The Iddncys vary in colour according to the severity and stage 

 of the disease when death occurs. In the early stages, when the 

 bladder contains port- wine coloured urine, they are enlarged and 

 of a uniform dark brownish -red colour, aud the vessels are uni- 

 formly distended with red corpuscles. The secreting structures 

 are not seemingly altered. In cases which die after the acute 

 stage and fever have passed away, they are paler than natural 

 and quite flabby, having pigmentary deposits in the convoluted 

 tubules, and their epithelium so loaded with a reddish-yellow 

 pigment that they are easily traceable in their windings by their 

 colour. In those cases where the capillaries are filled with red 



