45 



2. DISEASES OF THE AIR PASSAGES CAUSED 

 KY MITES. 



There is a minute parasite similar to tlie parasite 

 of mange that infests the air passages and specially 

 the windpipe, the bronchial tubes and the large air 

 spaces in the chest. It is known as Cytodties nudus. 

 Sometimes these parasites penetrate beyond the air 

 sacs and reach the air spaces in the bones. When 

 present in large numbers, they cause an inflammation 

 of the parts they infest, but when pre.«»ent in small 



Thb Air-sao Mite of Fowls. 

 Cytodites nudus, one hundred times natural size. 



numbers the}- seem to produce no disturbance. The 

 disease produced by (hem in the bronchial tubes is of, 

 the nature of a bionchitis of a severe type and some- 

 times there is inflainmatic-n of the lungs, or pneumonia, 



