Pulmonary (Edema. 205 



jacent one, and oedema so caused may bs found especially in cattle 

 and pigs in which the interlobular connective tissue is specially 

 abundant. This may be seen in miliary tuberculosis in cattle, and 

 it probably contributes to produce the extraordinary liquid col- 

 lections that characterize lung plague. In cattle also malignant 

 oedema may affect the lung, and an cedematous condition is some- 

 times met with in malignant catarrh. Bright's disease is another 

 cause, the ursemic dropsy finding a favorite seat of election in 

 the loose lung tissue unsupported by solid tissues. The ansemia 

 resulting from parasitism like distomatosis may similarly afEect 

 the lung. 



The symptoms of pulmonary oedema will usually be compli- 

 cated by those of the affection causing it. Thus modification of 

 the first heart sound or of the urinary secretion, or the existence 

 of parasitism, would furnish valuable indications. 



The physical signs of lung disease vary. If pneumonia is 

 present it is betrayed by its characteristic symptoms. In the ab- 

 sence of inflammation there is dullness on percussion over the 

 affected area, and on auscultation an absence of the respiratory 

 murmur, and perhaps abnormal clearness of bronchial, cardiac 

 and other sounds from deeper parts. It differs from pneumonia 

 in the absence of fever and of any crepitation surrounding the 

 consolidated portion. The expectoration is serous or watery, 

 rather than rusty or purulent. 



The prognosis is always grave in proportion to the incurable 

 nature of the primary disease. Chronic valvular or Bright's 

 disease, miliary tuberculosis or malignant tumors would render 

 the case hopeless, while in acute pneumonia, or nephritis or para- 

 sitism there may be some hope. The treatment will largely con- 

 sist in the therapeutics of the primary disease, yet we may also 

 seek to relieve the dangerous sj'mptoms of oedema. The fre- 

 quent change of position may serve to limit hypostatic accumula- 

 tion. Diuretics or purgatives in strong patients will favor ab- 

 sorption. Pilocarpin more than any other agent secures tem- 

 porary absorption but cannot be continued owing to its depressing 

 effects. Digitalis is often valuable in improving the heart's 

 action, and acting freely on the kidneys. Dry capping on the 

 chest acts as a derivative. 



