Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 771
andoften dangerous symptoms are caused by theexpansion of the air inside their bodies. In ascend-ing very high mountains it is necessary to go very equal to that outside, so that they can ascend anddescend as rapidly as they wish, without feeling theleast inconvenience. In the body of the bird… … PENGUINS (SWIMMERS AND DIVERS). slowly and to stop very often, to give time for someof the expanded air to escape, and equalize thepressure again. Now, many birds, the condor, forexample, fly over the tops of the highest mountains,and nearly all birds, either occasionally or habitu-ally, ascend to…
Children's literature
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