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Hooke, Robert, 1635-1703

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


So that Cork seems to suck its nourishment from the subjacent bark of the
Tree immediately, and to be a kind of excrescence, or a substance distinct
from the substances of the entire Tree, something _analogus_ to the
Mushrome, or Moss on other Trees, or to the hairs on Animals. And having
enquir'd into the History of Cork, I find it reckoned as an excrescency of
the bark of a certain Tree, which is distinct from the two barks that lie
within it, which are common also to other trees; That 'tis some time before
the Cork that covers the young and tender sprouts comes to be discernable;
That it cracks, flaws, and cleaves into many great chaps, the bark
underneath remaining entire; That it may be separated and remov'd from the
Tree, and yet the two under-barks (such as are also common to that with
other Trees) not at all injur'd, but rather helped and freed from an
external injury. Thus _Jonstonus_ in _Dendrologia_, speaking _de Subere_,
says, _Arbor est procera, Lignum est robustum, dempto cortice in aquis non
fluitat, Cortice in orbem detracto juvatur, crascescens enim praestringit &
strangulat, intra triennium iterum repletur: Caudex ubi adolescit crassus,
cortex superior densus carnosus, duos digitos crassus, scaber, rimosus, &
qui nisi detrahatur dehiscit, alioque subnascente expellitur, interior qui
subest novellus ita rubet ut arbor minio picta videatur_.


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