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Hooke, Robert, 1635-1703

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


At the end of each Sprout are generally four sprigs, two at the
Extremity, and one on each side, just under it. At the first sprouting
of these from the Branch to the Sprig where the leaves grow, they are
full of little short white hairs, which wear off as the leaves grow,
and then they are smooth as the Branch.
Upon each of these sprigs, are, for the most part, eleven pair of
leaves, neatly set into the uppermost part of the little sprig, exactly
one against another, as it were in little _articulations_, such as
Anatomists call _Enarthrosis_, where the round head of a Bone is
received into another fitted for its motion; and standing very fitly to
shut themselves and touch, the pairs just above them closing somewhat
upon them, as in the shut sprig; so is the little round _Pedunculus_ of
this leaf fitted into a little cavity of the sprig, visible to the eye
in a sprig new pluck'd, or in a sprig withered on the Branch, from
which the leaves easily fall by touching.
The leaf being almost an oblong square, and set into the _Pedunculus_,
at one of the lower corners, receiveth from that not onely a _Spine_,
as I may call it, which, passing through the leaf, divides it so
length-ways that the outer-side is broader then the inner next the
sprig, but little _fibres_ passing obliquely towards the opposite
broader side, seem to make it here a little muscular, and fitted to
move the whole leaf, which, together with the whole sprig, are set full
with little short whitish hairs.


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