140 Annual Report of the Royal Veterinary Colley e. 
1. Swine Fever . — Attacks pigs of any breed or age, but is most fatal in 
young animals. Has an incubative period of eight to ten days. Discolora- 
tion of the skin is a common but not a constant symptom. Generally 
attended with constipation or diarrhoea, quick breathing, and cough. Seldom 
fatal within less than a week, and often lasts for two or three weeks or 
more. Save in very acute cases, bowel lesions are constant, and pneumonia 
is almost equally constant. The bowel affection may take the form of a 
diffuse diphtheritic inflammation of the mucous membrane, sometimes of 
the small, generally of the large, intestine. In more chronic cases the lining 
of the large intestine is beset with well-defined “ ringed ” patches of dead 
tissue, the so-called “ ulcers,” or with nodular elevations (“ buttons ”) covered 
with dead mucous membrane. The lung disease is a catarrhal form of 
Diseased Heart of Pig, showing valvular excrescences, 
pneumonia, frequently attended with larger or smaller patches of blood 
effused into the lung tissue. Spleen, as a rule, not notably enlarged. 
2. Swine Erysipelas . — Coarser breeds (Yorkshire included) are least sus- 
ceptible. Generally attacks animals from three to twelve months old; 
older pigs are sometimes attacked, but sucking pigs seldom or never. In- 
cubative period, three to four days. Discoloration of the skin a very common 
symptom ; sometimes confined to the under surface of the body and inner 
surface of the limbs ; sometimes general, occasionally absent, at first bright 
red, later bluish or brownish red. Illness sets in suddenly, with high fever, 
great depression, weakness, paralysis of the hind quarters, and sometimes 
severe nervous disturbance. Death generally occurs on the second or third 
day of illness, sometimes within twenty-four hours, occasionally after a 
week, or even months (from chronic disease of the lining membrane of the 
