XI] BACILLI : SPECIFICALLY PATHOGENIC 215 



spleen is not enlarged. In the diseased lung and in the 

 liver there occur in the vessels and in the extravasated 

 blood numerous bacilli singly, or more commonly in larger 

 or smaller groups, sometimes forming emboli in the capil- 



FiG. 72. — Plate Cultivation op Bacillus of Grouse Disease, showing 

 DOT-LIKE Colonies in the Depth, patch-like Colonies on the 

 Surface. 



This illustration may serve also to show the character of a gelatine-plate culture 



of the typical Bacillus coli. 



Natural size. 



lary blood-vessels. These bacilli belong to one and the 

 same species; they are motile, either oval or even coccus-like ; 

 some few are rod-shaped. By cultivation on gelatine they 

 can be easily obtained in numerous colonies from the san- 

 guineous juice of the lung and liver ; only in few cases are 

 they to be seen in the heart's blood, both in cover-glass 



