DISEASES AND ABNORMALITIES. 149 
Arthritis. 
This disease occurs in_-young animals soon after 
birth. Roloff has observed pyzmic arthritis in the 
Foal, the Calf, and the Lamb. It is much less 
frequently seen in Puppies and Pigs. 
Modern researches, especially those of Bollinger, 
have led us to recognize: (1) Pyzmic arthritis, which 
is the most frequent form (Bollinger); it is consequent 
upon septic infection starting from the umbilical region. 
(2) Fatty degeneration of the red muscles, observed 
especially in young Pigs. (3) Acute articular rheuma- 
tism. (4) Acute or chronic muscular rheumatism. (5) 
Rachitis of young Pigs. (6) Tetanus and cerebro- 
spinal meningitis in Lambs. (7) Consumption (Darr- 
sucht), a disease of young horses which is probably only 
an intestinal or ganglionic (mesenteric) tuberculosis (?). 
(8) Various other affections of sucklings, such as 
intestinal catarrh, pleuro-pneumonia, general weakness 
of the extensors of the limbs with contraction of the 
flexors (Colt, Dog). 
Causes.—Pyemic arthritis is due to the introduction 
into the blood of putrid matter coming from the 
suppuration of the thrombus of the umbilical vein. 
The starting point of the morbid processes is infection 
of the umbilical wound by the products of putrid 
decomposition often to be found in the unclean stable, 
the lambing pen, etc. The disease sometimes runs an 
enzootic course in flocks and stud farms, where it occa- . 
sions considerable loss. 
Pathological Anatomy.—Besides the changes already 
