Fig. I. 



Section through the Lung of Grouse dead of the Grouse 

 Disease. Magnifying power about i o. 



The air-cells appear solid, being filled with blood and exuda- 

 tion. Two large air-spaces are shown, filled with homogeneous 

 exudation. 



Fig. 2. 



Section through the Liver of Grouse dead of the Grouse 

 Disease. Magnifying power looo. 



a. Part of a large blood-vessel filled with blood-corpuscles. 



b. Capillary blood-vessel plugged with the bacilli. 



c. Liver cells. 



Fig. 3. 



A similar preparation as in Fig. 2. Magnifying power 1000. 

 Several capillary vessels are shown, plugged with the bacilli. 



Fig. 4. 



Section through the Lung, showing a mass of capillary blood- 

 vessels plugged with the Bacilli. Magnifying power 650. 



Fig. 5. 

 Plate cultivation of the Bacillus of Grouse Disease. Natural 



size. 



Each of the small dots is a colony growing in the depth. Each 

 of the larger white patches is a colony on the surface of the gelatine. 



Fig. 6. 



Streak-culture on gelatine of the Bacillus of Grouse Disease, 

 Natural size, 



