2. DISEASES OF THE AIR PASSAGES CAUSED 

 liV MITES. 



There is a minute parasite similar to tlie parasite 

 of mange tliat infests the air passages and specially 

 the wiridpipe, 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 present in small 



The Aik-sao Mite oir Fowls. 

 Cytuditen nuitus.oae hundred times natural size. 



numbers they seem lo produce no disturbance. The 

 disease produced by Ihem in the bronchial tubes is of 

 the nature of a bronchitis^ of a severe type and some- 

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



