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Scientific American, Vol. 45, No. 19 (1881) (1881)
leaf 10
t they absorb oxygen and of cobalt is added to the bath a bluish shade, either light the top of the cage, about two meters from the ground, and give out carbonic acid, like animals, while other plants or dark, may be given to the coating, which becomes very it was thought that the birds would avail… … GARDEN, © 1881 SCIENTIFIC AMERICIAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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