Galilei, Galileo
,
The systems of the world
,
1661
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451 - 480
481 - 510
511 - 540
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372
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The firſt
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vers and inventers
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of things ought to
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be admired.
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The true cauſe
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of the
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tion of vertue in
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the Magnet, by
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means of the
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ming.
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Of a new effect
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its neceſſary that
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the cauſe be
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wiſe new.
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It is proved,
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that Iron conſists
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of parts more
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til, pure, and
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pact than the
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net.
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A ſenſible proof
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of the impurity of
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the Magnet.
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* The
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hereby
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that the
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doth not all
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ſiſt of magnetick
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matter, but that
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the whiter ſpecks
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being weak, thoſe
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other parts of the
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Loadſtone of a
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more dark &
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ſtant colour,
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tain all that vertue
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wherewith bodies
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are attracted.</
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* A common
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ſewing needle.</
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<
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>SAGR. </
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<
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>Your whole diſcourſe hath been in my judgment very
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concluding, and this experiment of the Needle hath made me
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think it little inferiour to a Mathematical Demonſtration; and
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I ingenuouſly confeſſe, that in all the Magnetick Philoſophy, I
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never heard or read any thing, that with ſuch ſtrong reaſons
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gave account of its ſo many admirable accidents, of which, if the
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cauſes were with the ſame perſpicuity laid open, I know not
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what ſweeter food our Intellects could deſire.</
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<
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>SALV. </
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<
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>In ſeeking the reaſons of concluſions unknown unto
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us, it is requiſite to have the good fortune to direct the
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courſe from the very beginning towards the way of truth; in
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which if any one walk, it will eaſily happen, that one ſhall meet
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with ſeveral other Propoſitions known to be true, either by
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putes or experiments, from the certainty of which the truth of
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ours acquireth ſtrength and evidence; as it did in every reſpect
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happen to me in the preſent Probleme, for being deſirous to
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ſure my ſelf, by ſome other accident, whether the reaſon of the
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Propoſition, by me found, were true; namely, whether the
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ſtance of the Magnet were really much leſſe continuate than that
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of Iron or of Steel, I made the Artiſts that work in the Gallery
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of my Lord the Grand Duke, to ſmooth one ſide of that piece
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of Magnet, which formerly was yours, and then to poliſh and
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burniſh it; upon which to my ſatisfaction I found what I deſired.
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<
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>For I diſcovered many ſpecks of colour different from the reſt,
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but as ſplendid and bright, as any of the harder ſort of ſtones;
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the reſt of the Magnet was polite, but to the tact onely, not
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being in the leaſt ſplendid; but rather as if it were ſmeered over
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with ſoot; and this was the ſubſtance of the Load ſtone, and
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the ſhining part was the fragments of other ſtones intermixt
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therewith, as was ſenſibly made known by preſenting the face
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thereof to filings of Iron, the which in great number leapt to
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the Load-ſtone, but not ſo much as one grain did ſtick to the
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ſaid ſpots, which were many, ſome as big as the fourth part of
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the nail of a mans finger, others ſomewhat leſſer, the leaſt of
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all very many, and thoſe that were ſcarce viſible almoſt
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merable. </
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<
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>So that I did aſſure my ſelf, that my conjecture was
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true, when I firſt thought that the ſubſtance of the Magnet
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was not cloſe and compact, but porous, or to ſay better,
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gy; but with this difference, that whereas the ſponge in its
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cavities and little cels conteineth Air or Water, the Magnet hath
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its pores full of hard and heavy ſtone, as appears by the
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ſite luſtre which thoſe ſpecks receive. </
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<
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>Whereupon, as I have ſaid
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from the beginning, applying the ſurface of the Iron to the
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perficies of the Magnet the minute particles of the Iron, though
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perhaps more continuate than theſe of any other body (as its </
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