214 MICRO-ORGANISMS AND DISEASE [cHAP. 



day, nor do they die before the fifth day. The course of the 

 disease, the symptoms and the appearances after death, the 

 morphology and cultural characters of the microbe, dis- 

 tinguish this disease from fowl cholera. 



Fig 71. — Plate Cultivation of the Bacillus of Fowl Enteritis, show- 

 ing NUMEROUS dot-like COLONIES IN THE DePTH OF THE GeLATINE, AND 



DISC-SHAPED Colonies on the Surface, thus showing a striking Con- 

 trast TO Fig. 63 of a Plate Culture of Bacillus of Fowl Cholera. 

 Natural size. 



6. Grouse disease. — The fatal disease which affects red 

 grouse, and known as the grouse disease, is an acute infec- 

 tious disease, of which the chief, and we may say the essen- 

 tial, pathological character is that of pneumonia, the lungs 

 being greatly congested, and sometimes one or the other 

 portion almost in a state of red hepatisation with engorge- 

 ment of the blood-vessels and extravasation of blood into 

 the air-spaces ; the serosa and mucosa of the intestine show 

 patchy redness ; the liver is greatly congested and dark ; the 



