Infectious Broncho- Pneumonia of Cattle. 285 



peritoneum caused death in fifteen to eighteen hours with intense 

 purulent peritonitis. 



Sheep and calves taking i cubic centimeter, subcutem had high 

 fever, temperature 105.8° F. with anorexia and great prostration 

 from which they recovered in a few days. Similar inoculations into 

 the lungs proved fatal in forty-eight hours with extensive bron- 

 cho-pneumonia and pleurisy. 



As the affection is caused by a bacillus which enjoys a sapro- 

 phytic existence outside the animal body, the same conditions 

 favor its attack as in simple bronchitis: (chill, climatic vicissi- 

 tude, low condition, fatigue, excitement, hot, close stables, the 

 inhaled dust of railway travel, etc. ) . Yet the disease occurs in 

 cattle at pasture where nothing appears as a factor except the mi- 

 crobe, and perhaps a chill, or an attack of costiveness and indi- 

 gestion. 



Symptoms. After an uncertain incubation the patient becomes 

 dull, weary, separates from the herd, and has hurried, op- 

 pressed breathing, sometimes with a grunt, a short, hacking 

 cough, anorexia, agalactia, costiveness and a remarkable rise of 

 temperature (107° F. to 108° F.). The mucosae assume a 

 yellow tint and the urine becomes red as the result of destruction 

 of the red globules and the diffusion of the coloring matter 

 through the blood, tissues and urine. Auscultation and percus- 

 sion bring out indications of the lobular infiltration. Percussion 

 resonance is lost over small areas especially toward the lower part 

 of the lungs, and around the margin of each flat area there may 

 be detected a line of crepitation, while in the center of the area 

 are heard sounds produced in other parts and abnormally clear 

 for that situation (heart sounds, blowing and mucous riles, ab- 

 dominal rumbling). The symptoms gradually increase in severity 

 and death may supervene in from eight hours to eight days. In 

 favorable cases the progress of the malady is slow and improve- 

 ment may set in early and go on to a complete recovery. In 

 some instances chronic lesions are left in the lungs which con- 

 tinue to interfere with respiration. 



Diagnosis. The origin of the cattle in a locality where this 

 disease is known to occur, the fact that they had the range of 

 corn-fields, or were fed corn-stalks, the sudden development of 

 the disease, the very high temperature, the yellow mucosae and 



