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He says sometimes, that the air is light and mounts upwards, and sometimes, that it is neither heavy nor light. For in his Second Book of Motion he says, that the fire, being without gravity, ascends upwards, and the air like to that; the water approaching more to the earth, and the air to the fire. But in his Physical Arts he inclines to the other opinion, that the air of itself has neither gravity nor levity.

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load focus Greek (Gregorius N. Bernardakis, 1895)
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