26 The Management and Diseases of the Dog. 



through the mitral valve with the one in the auricle, while 

 a prolongation from it extends into the aorta. 



"Lungs. — After removal, on inverting them, a quantity 

 of dirty brown frothy fluid escapes through the larynx. 



"The anterior and middle lobes and the anterior half of 

 the posterior lobe of the right lung are solidified, being of a 

 dark reddish-brown colour, and contrasting strongly with 

 the unaffected parts. The pleural surfaces are smooth, and 

 there is no exudation. On section the lung-tissue is of a 

 dark red colour, the surface of the section finely granular, 

 and bathed with a quantity of reddish-brown serum. On 

 close inspection it is seen that the air-cells are uniformly 

 filled with a solid exudation ; attempts at inflation of the 

 affected portions with air are unsuccessful. Portions ex- 

 cised sink at once when placed in water. In the left lung 

 the apex of the anterior lobe, the whole of the middle, and 

 the root of one of the posterior lobes are in the same con- 

 dition. The portions of the organs not diseased are of a 

 rosy red externally, and on section contain much blood 

 and frothy serum. Between the healthy and diseased 

 parts there is a zone of intense hypersemia. 



"Trachea. — -On slitting up the windpipe the mucous 

 membrane is found covered with a dark frothy mucus. The 

 membrane looks pale and natural to within an inch of the 

 bifurcation, but at this point it becomes reddened, and un- 

 even from the projection of irregular little masses of a 

 greyish-yellow colour, which on close inspection are found 

 to be localised swellings of the membrane, containing small 

 parasitic worms, the white bodies of which can be seen 

 lying upon and partially imbedded in these elevations. 

 They are most abundant just at the bifurcation, at the 

 lower part of which several have emerged,, forming an 

 elevation three or four lines in height. About the orifices 

 of the second divisions these little masses are also seen, and 

 the whole mucous membrane of this region is deeply con- 

 gested, and somewhat swollen. Very few of the worms 



