206 THE GROUSE IN HEALTH AND IN DISEASE 



While, therefore, it is possible that the virulent form of disease does, in fact, 

 sometimes occur, it is also possible that the belief in it is entirely without 

 justification, and is the result of inadequacy in method and inaccurracy in 

 observation. 



During the investigations of the Committee's observers, an interesting side- 

 light has been thrown on a possible connection between Coccidiosis and the 

 earlier work of Tegetmeier on pneumo-enteritis. 



In some Grouse-chicks dying of intestinal Coccidiosis, cysts were found in the 

 bronchioles, bronchi, and trachea, but not in the lung-tissue itself, while the lungs 

 of the young birds exhibited apparent symptoms of pneumonia. The coccidian 

 cysts in the bronchioles might be capable of setting up suflicient irritation to 

 account for the pneumonic symptoms. It is possible that there may be here 

 some explanation of the pneumo-enteritis of earlier writers. 



