The Natural History of Selborne

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Harper & Bros., 1868 - 335 páginas
 

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Página 299 - ... bowl is hung, especially when they have been motionless, and are perhaps asleep. As fishes have no eyelids, it is not easy to discern when they are sleeping or not, because their eyes are always open. Nothing can be more amusing than a glass bowl containing such fishes : the double refractions of...

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