2l8 



MICRO-ORGANISMS AND DISEASE [chap. 



respiration, and by inoculation with the diseased particles 

 of lung and intestine the disease is easily reproduced in 

 healthy swine. After an incubation period varying from 

 between two days and six to seven days the animals are 

 quiet and refuse food, the body temperature shows slight 

 rise, red patches of transitory nature are noticed on the 

 belly and thighs ; cough and occasionally diarrhcea of fluid 

 evacuations declare themselves soon ; the inguinal lymph- 

 glands appear enlarged. In severe cases the diarrhcea 



Fig. 75. — Fi;i)M a Section thkolgh the Kidney of Rahbit dead of Swine 

 Fe\er, showing a Malitghian Corpuscle, the Capillaries of the 

 Glomerulus deing transformed into hyaline laipermealle Cylinders. 



I. Bacilli. 



Masnifyinj power 500. 



increases, the fever continues, the cough becomes more 

 pronounced ; this state lasts for a few days, seldom more 

 than a week, and under general prostration the animal suc- 

 cumbs. In a large percentage (50) of cases the animals 

 recover. In mild cases, representing a considerable per- 

 centage, the disease is diagnosed only with difficulty ; the 

 rise of temperature is only slight and transitory, lasting only 

 a day or two ; the animals feed fairly well ; show only, very 

 occasionally at long intervals, a slight cough ; the inguinal 

 glands are slightly enlarged. These symptoms are so slight 



