In order that you may not, by any chance, believe that Aristotle thought that the purely and simply heavy is not earth but in general that which is under everything else, see <i>De Caelo</i>, Book IV, text #29 [311b5], where he says that everything except earth has lightness. </s>
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<p>
<s id="id.5.0.1.01.00"/>
<s id="id.5.0.1.01.01">What Aristotle says in Book IV of the <i>De Caelo</i>, text #32 [ch.4, 311b22-24] has no value: It is impossible for fire to have heaviness, because it would stand under some other thing. </s>
<s id="id.5.0.1.01.02">If the elements are transmuted into one another, how will fire not have heaviness, when it is made from heavy air?</s>
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<p>
<s id="id.5.0.2.00.00"/>
<s id="id.5.0.2.00.01">Aristotle, in Book III of the <i>De Caelo</i>, text #27 [301b11-13], says that in a violent motion, as the greater mobile is to the smaller, so is the swiftness of the smaller to the swiftness of the greater, if they are impelled by the same force. </s>
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<p>
<s id="id.5.0.3.00.00"/>
<s id="id.5.0.3.00.01">It is foolish to raise a doubt about how a projectile is moved by an impressed force: for it is moved just as it happens in the case of other motions: as, for instance, iron is moved in an alterative motion and made hot by fire. </s>
<s id="id.5.0.3.00.02">For fire impresses heat; then when the iron has been removed from the fire, the heat remains, but not by the surrounding force and heat, if it is transported into very cold air; then little by little the iron is moved toward coldness, as long as it cools off: in a similar way a stone is moved by a human being: and when it has been released by a human being it is still moved, the surrounding air being unchanged, as long as it tends toward rest. </s>
<s id="id.5.0.3.00.03">Again similarly: someone strikes a bell with a hammer, and deprives it of silence; the bell is then moved, the striking thing having been removed, and the sonorous quality proceeds </s>
