Wilkins, John, A discovery of a new world : or a discourse tending to prove, that 'tis probable there may be another Habitable World in the Moon ; with a discourse concerning the Probability of a Passage thither; unto which is added, a discourse concerning a New Planet, tending to prove, that 'tis probable our earth is one of the Planets

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That the Moon may be a World.
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              <pb o="145" file="0157" n="157" rhead="That the Moon may be a World."/>
            high, they can keep themſelves up, and ſoar a-
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            bout by the meer extenſion of their Wings.
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            </s>
            <s xml:space="preserve">Now the Reaſon of this difference, is not (as
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            ſome falſly conceive) the depth of the Air un-
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            der them. </s>
            <s xml:space="preserve">For a Bird is not heavier when
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            there is but a foot of Air under him, than when
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            there is a Furlong. </s>
            <s xml:space="preserve">As appears by a Ship in
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            the Water, (an inſtance of the ſame nature)
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            which does not ſink deeper, and ſo conſequent-
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            ly is not heavier, when it has but five Fathom
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            depth, than when it has Fifty. </s>
            <s xml:space="preserve">But the true
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            reaſon is, the weakneſs of the deſire of Uni-
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            on in Denſe Bodies at a diſtance.</s>
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            <note position="left" xlink:label="note-0156-03" xlink:href="note-0156-03a" xml:space="preserve">Nat. Hiſt.
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            Cent. 1.
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            exper. 33.</note>
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            <s xml:space="preserve">So that from hence, there might be juſt oc-
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            caſion to Tax Ariſtotle and his Followers, for
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            Teaching, that heavineſs is an abſolute quality
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            of it ſelf, and really diſtinct from condenſity:
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            </s>
            <s xml:space="preserve">whereas ’tis only a Modification of it, or ra-
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            ther, another Name given to a condenſed Bo-
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            dy, in reference to its Motion.</s>
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            <s xml:space="preserve">For if it were abſolute, then it ſhould al-
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            ways be inherent in its Subject, and not have
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            its Eſſence depend upon the Bodies being here
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            or there. </s>
            <s xml:space="preserve">But it is not ſo. </s>
            <s xml:space="preserve">For,</s>
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            <s xml:space="preserve">1. </s>
            <s xml:space="preserve">Nothing is heavy in its proper place, ac-
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            cording to his own principle, Nibil grave eſt
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            in ſuo loco. </s>
            <s xml:space="preserve">And then,</s>
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            <s xml:space="preserve">2. </s>
            <s xml:space="preserve">Nothing is heavy, which is ſo far diſtant
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            from that proper Orb to which it does belong,
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            that it is not within the reach of its Virtue. </s>
            <s xml:space="preserve">As
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            was before confirm’d.</s>
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            <s xml:space="preserve">But unto this it may be objected. </s>
            <s xml:space="preserve">Though a
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            Body being ſo plac’d, be not heavy in in actu ſe-
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            cundo; </s>
            <s xml:space="preserve">yet it is in actu primo: </s>
            <s xml:space="preserve">becauſe it re-
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            tains in it an inward proneneſs to move down-</s>
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