Salusbury, Thomas, Mathematical collections and translations (Tome I), 1667

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              <s>
                <pb xlink:href="040/01/429.jpg" pagenum="407"/>
              trary, the Tide is the cauſe of them, that is, of bringing them
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              into the brains more apt for loquacity and oſtentation, than for
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              the ſpeculation and diſcovering of the more abſtruſe ſecrets of
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              Nature; which kind of people, before they can be brought to
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              prononnce that wiſe, ingenious, and modeſt ſentence,
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              I know it
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              not,
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              ſuffer to eſcape from their mouths and pens all manner of
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              travagancies. </s>
              <s>And the onely obſerving, that the ſame Moon, and
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              the ſame Sun operate not with their light with their motion, with
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              great heat, or with temperate, on the leſſer reeeptaces of Water,
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              but that to effect their flowing by heat, they muſt be reduced to
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              little leſſe than boiling, and in ſhort, we not being able artificially
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              to imitate any way the motions of the Tide, ſave only by the
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              tion of the Veſſel, ought it not to ſatisfie every one, that all
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              the other things alledged, as cauſes of thoſe eſſects, are
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              vaine fancies, and altogether eſtranged from the Truth. </s>
              <s>I
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                <arrow.to.target n="marg795"/>
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              ſay, therefore, that if it be true, that of one effect there is but
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              one ſole primary cauſe, and that between the cauſe and effect,
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              there is a firm and conſtant connection; it is neceſſary that
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              ſoever there is ſeen a firm and conſtant alteration in the effect,
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              there be a firm and conſtant alteration in the cauſe. </s>
              <s>And
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              cauſe the alterations that happen in the ebbing and flowing in
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              ſeveral parts of the Year and Moneths, have their periods firm and
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              conſtant, it is neceſſary to ſay, that a regular alteration in thoſe
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              ſame times happeneth in the primary cauſe of the ebbings and
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              flowings. </s>
              <s>And as for the alteration that in thoſe times happens
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                <arrow.to.target n="marg796"/>
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              in the ebbings and flowings conſiſteth onely in their greatneſs;
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              that is, in the Waters riſing and falling more or leſſe, and in
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              running with greater or leſſe
                <emph type="italics"/>
              impetus
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              ; therefore it is neceſſary,
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              that that which is the primary cauſe of the ebbing and flowing,
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              doth in thoſe ſame determinate times increaſe and diminiſh its
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              force. </s>
              <s>But we have already concluded upon the inequality and
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              irregularity of the motion of the Veſſels containing the Water to
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              be the primary cauſe of the ebbings and flowings. </s>
              <s>Therefore
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              it is neceſſary, that that irregularity, from time to time,
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              ſpondently grow more irregular, that is, grow greater and leſſer.
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              </s>
              <s>Now it is requiſite, that we call to minde, that the irregularity,
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              that is, the different velocity of the motions of the Veſſels, to
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              wit, of the parts of the Terreſtrial Superficies, dependeth on
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              their moving with a compound motion, reſulting from the
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              mixtion of the two motions, Annual and Diurnal, proper to the
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              whole Terreſtrial Globe; of which the Diurnal converſion, by
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              one while adding to, and another while ſubſtracting from, the
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              Annual motion, is that which produceth the irregularity in the
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              compound motion; ſo that, in the additions and ſubſtractions,
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              that the Diurnal revolution maketh from the Annual motion, </s>
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          </chap>
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