Publisher's Synopsis
Excerpt from Proceedings of the Cambridge Philosophical Society, 1876, Vol. 2
Bearing in mind that the air-sacs occur in all birds that their number and position is very uniform that they always have very free communications with the lungs; that the greater part of the air inspired passes into them, and is again expelled in expiration, We 'can soarcely doubt that they are a necessary part of the respiratory apparatus of birds.
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