DISEASES OF THE BLOOD. 



133 



and devoid of healtty resonance. Auscultation determines 

 dulness, more or less marked in certain parts of the 

 tliorax, this being dependent either upon fluid in the 

 chest or lung consolidation. Sometimes only one lung is 

 affected, then there is increased resonance in the other ; 

 also a " friction sound," indicative of pleuritic changes, is 

 present. With the progress of the disorder the milk 

 becomes reduced to a very small quantity, and sometimes 

 entirely suppressed. There is expulsion of colourless, 

 or -white, pale, straw-coloured and blood-tinged casts, 

 by coughing or expectoration (Walley). The bowels remain 

 constipated, as before, until the mouth becomes clammy, 

 and signs of debility (cedematous swellings, diarrhoea, hoven, 

 and pallor of mucous membranes, &c.) usher in death. 



Post-mortem examination. — No appreciable alteration in 

 the blood except such changes as are characteristic of dimi- 

 nished excretion and anaemia. Pathological conditions ob- 

 servable only in the thoracic viscera. The pleura presents 

 extensive false membranes, and its sac is full of serous fluid 

 of a somewhat milky colour, with numerous shreds of lymph 

 floating about in it. Adhesions unite the pleura pulmonalis 

 to pleura costalis, and the deposits have a markedly plastic 



Fig. 22. — Incipient Pleuro pneumonia epiznotica. a. Diseased patches as 

 seen from the surface, b. A section into the healthy and diseased parts. 

 (Simonds.) 



character 

 is pus 



m 



Occasionally, it is said, but very rarely, there 

 the pleural sac. The membrane itself is 



