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Updated: May 19, 2025
We find that his normal temperature is about two degrees higher than ours, and that he breathes faster, and that his bones are lighter, and that his body is full of air-sacs, fitting him to fly. But how does he do it? How does he poise himself on an invisible ledge of air, "Motionless as a cloud ... That heareth not the loud winds when they call, And moveth altogether if it move at all?"
It removes the quickly used-up substances from every part, and the choke-damp or carbonic acid which would stop the whole machine, and kill us, were it not got rid of through the lungs as the blood hurries through the walls of these air-sacs, whilst other used-up materials are carried by it to the kidneys and passed out of the body through them.
Masses of epidermic scales may form around the broken ends of the feathers. The diagnosis can be confirmed by examining the skin lesions and finding the mite. A post-mortem examination of a fowl that has died of this disease shows the mites on the surface of the lining membrane of the air-sacs. They appear as a white or yellow dust.
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