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Diseases of Poultry 



becoming thicker, the inflammation extends to the adjoining 

 surfaces, and new diphtheritic centers develop, uniting with 

 each other until the cheeks, the tongue, the palate, the throat, 

 and the inside of the nostrils are covered. Very often the 



Tumor with hard cheesy center. 



Fibrinous masses over mouth and tongue and protruding. 

 Fig. 31. — Diphtheritic roup or canker. (After Roebuck.) 



inflammation extends from the nostrils to the eyes and the 

 sacs beneath the eyes, and sometimes it penetrates the air 

 tubes to the lungs or the gullet to the crop. 



This extension of the disease leads to the appearance of 

 other symptoms. The inflammation in the nostrils causes 



