Diseases of the Respiratory System 173 



growths are made up almost entirely of pus germs. These 

 growths should probably be considered as suppurating 

 wounds. An unhealthy condition of the mucous membrane 

 of the mouth due to digestive disorders is sometimes accom- 

 panied by spots of canker. 



A good treatment for canker is undiluted creolin applied 

 with a cotton swab. The swab should be held against 

 each sore for a short time. The whole surface of each patch 

 should be treated. Another good treatment is to wash the 

 sores with hydrogen peroxide 1 part and water 1 part. 



Thrush 



This term is also sometines incorrectly applied to the false 

 membranes of diphtheria, but there are at least two cases of 

 true thrush on record. That is, in two cases microscopic 

 examination has shown that the patches, which in both these 

 cases were in the lower part of the esophagus and crop, were 

 made up of spores and filaments of the fungus Saccharomyces 

 albicans. This fungus causes thrush in children and calves. 

 This disease may also occasionally affect the mouth. It is 

 impossible to distinguish it from other diseases causing simi- 

 lar formations except by microscopic examination. The 

 treatment is the same as for canker. 



Aspergillosis (Mycosis of the Air Passages) 



This is a very common disease of poultry, often mistaken 

 for tuberculosis. In adult fowls it is a frequent cause of the 

 condition known as "going light," while in young chickens 

 it probably ranks next to white diarrhea as a lethal agent. 



The discussion of this disease here relates primarily to 

 adult fowls. Aspergillosis in young chicks is treated in 

 Chapter XIX. 



