Of Mathematicall thinges, are two principall kindes: namely, $Number$ and $Magnitude$. $Number$, we define, to be, a certayne Mathematicall Sume, of $Vnits$. And, an $Vnit$, is that thing Mathemmaticall, Indivisible, by participation of some likenes of whose property, any thing, which is in deede, or is counted One, may resonably be called One. We account a $Vnits$, a thing $Mathematicall$, though it by no $Number$, and also indivisible: because, of it, materially, Number doth consist: which, principally, is a thing $Mathematicall$. $Magnitude$ is a thing $Mathematicall$, by participation of some liknes of whose nature, any thing is judged long, broade, or thicke, is also broade & long. A broade magnitude, we call a $Superficies$ or a Plaine. Every playne magnitude, hath also length. A long magnitude, we terme a $Line$. A $Line$ is neighter thicke nor borade, but onely long: Every certayne Line, hath two endes: The endes of a line, are $Pointes$ called.

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