XI 



BACILLI: SPECIFICALLY PATHOGENIC 219 



and so little marked that it requires careful examination to 

 diagnose the disease ; nevertheless, on auscultation of the 

 chest distinct lung disease may be recognised. On post- 

 mortem examination of such slight cases the symptoms of 

 the disease of the lung are easily confirmed. 



In the well-pronounced cases dying naturally the poit- 

 mortem examination shows the following. The lungs of both 

 sides show severe, extensive, lobar pneumonia, involving 

 sometimes the greater part of the lung ; the lobules show 



^ 'to 





'1/ 



Fig. 76. — Bloou of FhEsH Stleen of a Mou^e that died of Swine Fever. 



1 Blood discs. 



2 A large nucleus. 



3. Crroups of minute bacilli. 



4. Long bacilli. 



5. Dumb-bells of bacilli. 

 i\Jagnirying power 700. (Stained with gentian violet.) 



in recent cases all stages between congestion (punctilorm 

 hemorrhages) and hepatisation ; the lobes that are longer 

 affected show more consolidation, and, the older this is, the 

 more grej', and solid, and necrotic, dry and friable, is this 

 part of the lung ; the septa between the lobes arc cedema- 

 tous and well-marked ; the bronchi and trachea contain 

 grey and sanguineous muco-purulent matter ; the endocard 

 of the left and occasionally the right ventricle, near the 



