Lung Plague in Cattle. 615 



8. Has hyperthermia been marked ? Indicative of lung plague. 



9. Have a succession of cases occurred at intervals of several 

 days or weeks, irrespective of weather? Suggestive of lung 

 plague. 



10. Have the indications of consolidated lung been early and 

 over extensive undivided areas ? Like lung plague. 



11. Have cases been milder in cold dry weather and more vio- 

 lent in hot and moist ? Such is lung plague. 



12. Does the same subject present lung lesions of very different 

 ages ; — infiltration with tough, elastic lung ; red hepatization ; 

 gray hepatization ; black infarction ; sequestra, etc.? Bespeaks 

 lung plague. 



13. Do the infiltration and red hepatization show a marbling 

 with very extensive filling and turgidity of the interlobular and 

 subpleural connective tissue, and abundant effusion into the chest? 

 This is the nature of lung plague. 



14. Does the lung exudate when inoculated in the tail of a 

 susceptible bovine animal (one that has never had the disease), 

 produce local inflammation and exudation and procure immunity ? 

 This characterizes lung plague. Does it fail to cause inocu- 

 lation-swelling, in an animal that had lung plague. Dung plague 

 is still more indicated. 



15. If the disease has lasted long enough in a place to deter- 

 mine, has it affected any other than bovine animals, and does 

 inoculation of the lung exudate into any other genus of animal 

 cause the disease? Other genera are immune from lung plague. 



Tuberculosis is distinguished by the habitual absence of the 

 high temperature, the numerous circumscribed areas of flatness 

 with wheezing or other abnormal lung sounds, in the midst of a 

 general field giving the normal respiratory murmur, by the en- 

 largement or induration of superficial lymph glands, by the re- 

 sponse to the tuberculin test, and by the lung tubercles and 

 diseased lymph glands, — congested, indurated, caseated, calci- 

 fied — found at the necropsy. Inoculation of other genera causes 

 tuberculosis. 



Simple bronchitis is usually connected with climatic change or 

 exposure, tends to affect a number at once, gives the blowing and 

 mucous rales, without indications of extended lung consolidation 

 or pleural effusion, and after death does not furnish lesions of all 

 ages, recent and remote. 



