Lung Plague in Cattle 663 



Verminous bronchitis, attacks the young only or mainly, and 

 never seriously injures the mature, involves all or nearly all the 

 young in the herd, shows less hyperthermia, and less extensive 

 consolidation, more wheezing in the lungs, and a free expectora- 

 tion in which the worms (embryos or adults) may be found by 

 careful search. 



Simple fibrinous pneum,onia is likely to arise from climatic con- 

 ditions or from exposure, attacks several at once and none later, 

 has less abrupt rise of temperature, less tenderness of the chest 

 walls, less dyspnoea, less obstinate standing, and after death, less 

 interlobular exudate and marbling, and no presentation of old 

 and recent lesions on the same lung. 



In the infectious pneumonia occasionally seen in western cattle, 

 the distinction must be made mainly by the less elevated tempera- 

 ture, less dyspnoea, the lack of the early signs of extensive con- 

 solidation of the affected lung, and after death, absence of the ex- 

 tensive interlobular infiltration, and in the predominance of the 

 whitish points or mottling indicating the broncho-pneumonia and 

 the cell proliferation in the terminal bronchia and alveoli . 



The pulmonary form oi hcemorrhagic septicemia (Wildeseuche) 

 is distinguished by its enzootic character, in connection with wet 

 lands, its occurrence in the summer season, its association with 

 other forms of localization, in the abdomen, muscular system, etc., 

 its dependence on a cocco-bacillus, easily found in the exudate, 

 and its inoculability on the smaller ruminants, horses, pigs and 

 rodents. 



The perforation of lungs and heg,rt by a sharp pointed foreign 

 body from the reticulum, occurs sporadically in one animal which 

 has usually been kept indoors ; it shows as a rule less fever, 

 may be preceded by tympany or other gastric trouble, shows a 

 line of consolidation from the reticulum forward, is earlier or 

 later complicated by morbid heart-sounds or rhythm, and com- 

 monly shows a pitting swelling beneath and beside the sternum. 



Pulmonary emphysema is sporadic only, usually devoid of sud- 

 den hyperthermia, or constitutional disorder, has a dry paroxysmal 

 cough, wheezing sounds on auscultation, and a drumlike sound 

 on percussion. If associated with bronchitis or pneumonia and 

 attendant fever, the case is more equivocal. 



Aspergillosis of the Lung usually advances more slowly, in the 

 comparative absence of sudden hyperthermia, shows more limited 



