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Hooke, Robert, 1635-1703

"Micrographia Some Physiological Descriptions of Minute Bodies Made by Magnifying Glasses with Observations and Inquiries Thereupon"


2 I have observ'd several kinds of these Figures, some smaller, no bigger
then a Two-pence, others so bigg, that I have by measure found one of its
stems or branches above four foot long; and of these, some were pretty
round, having all their branches pretty neer alike; other of them were more
extended towards one side, as usually those very large ones were, which I
have observ'd in Ditches which have been full of foul water.
3 None of all these Figures I have yet taken notice of, had any regular
position in respect of one another, or of the sides of the Vessel; nor did
I find any of them equally to exactness extended every way from the center
a.
4 Where ever there was a center, the branchings from it, ab, ac, ad, ae,
af, ag, were never fewer, or more then six, which usually concurr'd, or met
one another very neer in the same point or center, a; though oftentimes not
exactly; and were enclin'd to each other by an angle, of very near sixty
degrees, I say, very neer, because, though having endeavoured to measure
them the most acurately I was able, with the largest Compasses I had, I
could not find any sensible variation from that measure, yet the whole
six-branched Figure seeming to compose a solid angle, they must necessarily
be somewhat less.
5 The middle lines or stems of these branches, ab, ac, ad, ae, af, ag,
seem'd somewhat whiter, and a little higher then any of the _intermediate_
branchings of these Figures; and the center a, was the most _prominent_
part of the whole Figure, seeming the _apex_ of a solid angle or _pyramid_,
each of the six plains being a little enclin'd below the surface of the
_Urin_.


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