Book II. of Roots. 87 
33. $. As the Saline Principle is the Mould of the Succiferons, fo 
is the Aerial of the Aer-Vefféls. (a) Now the Particles of Aer ftriétly fo (2) P.1.0.4: 
called, at leaft of that part of it concerned in the Generation of the $-23-& P2; 
Aer-Veffls, Y füppofe, are crooked: and that by compofition of many 624: 
of thofe crooked ones together, fome of them become Spiral, or of 
fome other winding Figure: and that thereupon dependeth the Ela- 
fick Property of the Aer, or its being capable of Rarefaition and 
Condenfation by force. Wherefore, the faid crooked Particles of the 
Aer, firlt footing and fetting together, as the Mould, the other Prin- 
ciple cling and fx conformably round about them. So that, as by 
force of the Saline Principles, the reft of them are made to foot out 
in Long continued Fibres; fo by force of the Aerial, thofe Fibers are 
{till difpofed into spiral Lines, thus making up the Aer-Vefels. And 
according as there are fewer of thefe Aerial Particles, in proportion to 
the Saline, the Concave of the Aer-Veffls is varioufly wider,or the Fi- 
bres continue their hooting by wider Rings; as thole that come nearer 
to aright Line, and fo are more complient to theaigure and fhooting 
of the Saline parts. And whereas the Lympheduéis, hooting out on- 
lyin length, are never fenfibly amplified beyond their original fize : 
Thefe, on the contrary, always, more or leĝ, enlarge their Diameter 5 
becaufe their Fibres, being difpofed into Spiral Lines, muft needs 
therefore, as they continue their growth, be (till dilated into greater 
and greater Rings. And being at the bottom of the Root more res 
mote from the Aer, and fo having fomewhat fewer Particles purely 
Aerial, there ingredient to them, then at the top; they fall more un- 
der the government of the Saline, and fo come nearer to a right Line, 
that is into greater Circles; and fo the Aer-Veféls, made up of thofe 
Circles, are there generally wider. (b) Cb) Paca 
34. $. By mediation of their Principles, the Parenchymous Parts $.16, 
likewife of a Root have their proper Contexture. For from their A- 
cid Salt they are Fibrous from their Oyl, the Fibres are Round, and 
in all parts even within themfelves ; and from their spirit, it is molt 
probable, that they are alfo hollow. But becaufe the spirit is, here, 
More copious than the Aer; and the Saline Principle an Acid, (0) (e) $. 19. 
and fo, more under the government of the Spirit, than isan Alkali; 
therefore are not the faid Fibres continued in fraight Lines, as the 
Sap-Veffels ; or by one uniform motion, into fpiral lines, as the Fibres 
in the Aerial, but minding, ina circular manner, to and fro a thon- 
Jand ways, agreeable to the like motions of the Spirit, that moft adfive, 
and here molt predominant Principle, And the Spirituous Parts being, 
as is faid, here more copious and redundant, they will not only faf- 
fice to fill up the Concaves of the Fibres, but will alfo gather toge- 
ther into innumerable little fpaces, without them: whence the Fi 
bres cannot wind clofe together, as Thred, in a Bottom of Yarn 3 but 
are forced to keep at fome diftance, one parcel from another, and 
fo are difpofed, as Bread isin baking, into Bladders. (d) (Paez: 
35. $. And the under Fibres being fet firft, as the Warp, the fpi- 6.4. 
rituons parts next adjacent, will incline alfo to fix, and fo governan 
over-work of Fibres, wrapping, as the Woof, in {till finaller Circles 
round the other: whereby they are all knit together. (e) For the (+) P.i.c5 
fame reafon, the Lympheduits, being firit (ieee the Parenchymons as ied 
Fibres fet and wrap about Thefe alfo: (f) And the Aer-Vefel Eon Kia 
