Bacon, Francis, Sylva sylvarum : or, a natural history in ten centuries

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362Natural Hiſtory; ſalted throughout) goeth to the bottom. And therefore no marvel if the
draining of Water by deſcent, doth make it freſh:
Beſides, I do ſome what
doubt, that the very daſhing of the Water that cometh from the Sea, is
more proper to ſtrike off the ſalt part, than where the Water ſlideth of her
own motion.
It ſeemeth Percolation or Tranſmißion (which is commonly called Strain-
113. ing) is a good kinde of Separation, not onely of thick from thin, and groſs
from fine, but of more ſubtile Natures;
and varieth according to the Body,
through which the Tranſmißion is made.
As if through a Woollen-bag, the
liquor leaveth the fatneſs;
if through Sand, the ſaltneſs, & c. They ſpeak of
ſevering Wine from Water, paſſing it through Ivy-wood, or through other
the like porous body, but Non conſtat.
The Gum of Trees (which we ſee to be commonly ſhining and clear)
224. is but a fine paſſage, or ſtraining of the Juice of the Tree, through the
Wood and Bark.
And in like manner, Cornish Diamonds, and Rock Rubies,
(which are yet more reſplendent than Gums) are the fine Exudations of
Stone.
Ariſtotle giveth the cauſe vainly, Why the Feathers of Birds are of more
335. lively colours than the Hairs of Beaſts;
for no Beaſt hath any fine Azure, or
Carnation, or Green Hair.
He ſaith it is, becauſe Birds are more in the
Beams of the Sun than Beaſts, but that is maniſeſtly untrue;
for Cattle are
more in the Sun than Birds, that live commonly in the Woods, or in ſome
Covert.
The true cauſe is, that the excrementitious moiſture of living Crea-
tures, which maketh as well the Feathers in Birds as the Hair in Beaſts, paſs-
eth in Birds through a finer and more delicate Strainer, than it doth in Beaſts:
For Feathers paſs through Quills, and Hair through Skin.
The Clarifying of Liquors by Adheſion, is an inward Percolation, and is
446. effected, when ſome cleaving Body is mixed and agitated with the Liquors;
where by the groſſer part of the Liquor ſticks to that cleaving Body; and ſo
the finer parts are freed from the groſſer.
So the Apothecaries clarifie their
Syrups by Whites of Eggs, beaten with the Juices which they would clarifie;

which whites of Eggs, gather all the dregs and groſſer parts of the Juice to
them;
and after the Syrup being ſet on the fire, the whites of Eggs them-
ſelves harden, and are taken forth.
So Ippocraß is clarified by mixing with
Milk, and ſtirring it about, and then paſſing it through a Woollen-bag,
which they call Hippocrates Sleeve;
and the cleaving Nature of the Milk, draw-
eth the Powder of the Spices, and groſſer parts of the Liquor to it, and in
the paſſage they ſtick upon the Woollen-bag.
The clarifying of Water, is an experiment tending to Health, beſides
557. the pleaſure of the Eye, when Water is Cryſtaline.
It is effected by caſting
in, and placing Pebbles at the head of a Current, that the Water may ſtrain
through them.
It may be Percolation doth not onely cauſe clearneſs and ſplendor, but
668. ſweetneſs of ſavor;
for that alſo followeth, as well as clearneſs, when the
finer parts are ſevered from the groſſer.
So it is found, that the ſweats of
4949[Handwritten note 49]5151[Handwritten note 51] men that have much heat, and exerciſe much, and have clean Bodies and
fine Skins, do ſmell ſweet, as was ſaid of Alexander;
and we ſee commonly,
that Gums have ſweet odors.
5050[Handwritten note 50]779.88Experiments
in Conſort,
touching
Motion of
Bodies upon
their Preſſure.
TAke a Glaſs, and put Water into it, and wet your finger, and draw it
round about the lip of the Glaſs, preſſing it ſomewhat hard;
and
after you have drawn it ſome few times about, it will make the Water frisk
4949[Handwritten note 49]5151[Handwritten note 51]

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