BULLETIN 125 DECEMBER, 1902 



Ontario Agricultural College and Experimental Farm 



T^ o TJ :f». 



By Prof. F. C. Harrison and Dr. H. Streit, Bacteriological Depaitment of 

 the Ontario Agricultural College and Experimental Farm. 



The most widely spread and destructive disease affecting domestic 

 fowls in Ontario, and perhaps in Canada, is commonly known as 

 Roup, Canker, or Distemper. By some, the disease is called Cancer 

 of the Mouth, Throat, etc., or even by the name of Fowl Diphtheria; 

 but all these different names are given to the same disease, according: 

 as some particular symptom is more or less prominent 



Fig. 1.— A section of false membrane of a roupy fowl. a False membrance. 

 b Epithelium, e Submueosa. 



Econoviiic Importavce. The economic importance of this disease 

 is very great, as it is probably one of the greatest hindrances in the 



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