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Natural Eftate. j 
3. §. Secondly, As they appear upon the Infufiow of Plants into 
feveral Sorts of Liquors. 
4. §. Thirdly, As wpon the Mixture of thofe Infufions, or of any 
one of them with fome other Liquor, or other Body. 
5. §. Asthey appear in the Plants themfelves, it may be obferved 
inthe firft place, That there isa far lefs variety in the Colours of Roots, 
than of the other Parts: the Parenchyma being, within the Skiz, ufu- 
ally White, fometimes Yellow, rarely Red. The Canfé hereof being, 
for that they are kept, by the Barth, from a free and open Aer 3 which 
concurreth with the Juyces of the feveral Parts, to the Produédfion of 
their feveral Colours. And therefore the upper parts of Roots, when 
they happen to ftand naked above the Ground, are often deyed with 
feveral Colours : fo the tops of Sorrel Roots will turn Red,thofe of Mul- 
len, Turneps and Radifhes, will turn purple, and many others green. 
Whereas thofe parts of the fame Roots which lie more under Ground, 
are commonly White. 
6. §. As Roots are moft commonly White; fo the Leaves, Green, 
Which Colour is fo proper to them, that many Leaves, as thofe of Sage, 
the young Sprouts of St. ‘Fohns-wert, and others, which are Redifh 
when in the Bud 5 upon their full’ Growth, acquirea perfect Greer. 
7- §. The Caufe of this Colour, is the atfion of the Aer, both from 
within, and from without the Plz#t, upon the ‘Juyces thereof, where- 
by it ftrikes them into that Colour. 
8. §.. Bythe Aer from without, I mean that which furrounds the 
Body of the Plant: which is the Caufe of its Greenefi, not meerly as 
it is contiguous to it, but as it penetrates through the Pores of the 
Shim, thereinto ; and fo mixing with the Juyces thereof, plainly deys 
or ftrikes them into a Greev, 
9. §. By the Aer from within, I mean, that which entring, toge- 
ther with the Aliment, at the Root, thence afcends by the <Aer-Veffels. 
into the Truk and Leaves, and is there transfufed into all the feveral 
Fusces,thereby likewife concurring to their Yerdure. Whence it is, that 
the Parts of Plants which lie under Water, are Green,as well as thofe 
which ftand above it 5 becaufe, though the ambient 4er, conteined in 
the Water be but little, yet the want of it is compenfated, by that 
which afcends from the Root. 
To. §. And therefore it is obfervable, that the stalks of Marfh- 
Mallow, and fome other Plants, being cut tran{verfly, though the 
Parenchyma in the Barque be white, yet the Sap-Veffels which lie within 
that Parenchyma, are as Green as the Skin it felf; Jeil. becaufe they 
ftand clof to the Aer-Vefféls. The Parenchyma, 1 fay, which is inter- 
cepted from the Aer, without, by the shiz; and from the Aer within, 
bythe Sap-Veffels, is white: but the shiv, which is expofed to the Aer 
without, and the Sap-Veffels which are next neighbours to that with- 
in, are both equally Green. So likewife if a Carrot be plucked up, and 
f{uffered to lie fometime in the open Aer 5 that part which ftandeth in 
and near the Centre, amongf{t the Aer-Veffels, will become Green as well 
as the Shiv, all theother Parfs continuing of a Redifh Yellow, as before, 
The Aer therefore, both from without, and from within the Plant, to- 
giver with the Fuyces of the Plant, are all the concurrent C, anfes Of its 
erdure. 
The §. 

