88 Of the Vegetation Book II. 
formed in the Center, the fucciferous run along thofe likewife (as vo- 
Istile Salts fhoot along the fides of a Glafi, or aot, upon a Window) 
and fo are, as it were, Incruftate about them in a ing. 
How the fe- 36. $. SOME OF THE more Aitherial and Subtile parts of the Aer, 
venal Parts as they ftream through the Roof, it fhould feem, by a certain Maga. 
come tobe sfe, do gradually difpofe the Aer-Vefels, where there are any {tore 
Kr of them, into Rays. This Attraétion ( asI take leave to call it) or 
"POSÓ Magnetick, power betwixt the Aer and thefe Def, may be argued, 
From the nature of the Principles common to them both: From the 
Eleéral nature of divers other Bodies; the Load-ftone being not the 
(2) Lib. 1, Only one which is attractive: And from other EffeGs, both before (a) 
¢.2. $.25. & and hereafter mentioned. Wherefore in the inferiour parts of the 
ext» Append. Root, they are lef Regular; (b) becaufe more remote from the Aer. 
23. And in the upper parts of many Roots, as Gumfery, Borage, Parfnep, 
(2) Pot where thofe that are next the Centre are copfuled, or differently 
Tah 7,8,9. Jilpofed 5 thofe next the Barque, and fo nearer the der, are potu. 
"sed more Regularly, and ufually into Rays. For the fame reafon it 
may bes that even the sap-Veffels in the Barque, as often as the Aer 
Peffels are more numerous, are ufüally difpofed into Rays, as follow- 
ing the direction of the Aer-Vefelr. And that the Parenchyma of the 
Barque, is difpofed into Diametral Portions : and that where the Aer 
Veffels are fewer or fmaller, thefe Portions are likewife fmaller or none; 
as in Chervil, Afparagus, Dindelion, Orpine, Biftort, Horfe-Radifh, 
Tab. 7,8, 9, Potato’s, &c. 
&c 37. 9. The (aid AEtherial parts of the Aer, have a Power ov 
the 4er-Vofels not only thus to Difpofe them 5 but alfo to Sollicite 
and fpread them abroad from the Center towards the Circumference 
ofthe Root. By which means, thofe Roots which have no Pith in 
(Paros. their lower parts, obtain one in their upper. (¢) And the fame Pith, 
FA which in the lower part, isratably, (mall, in the upper, is more or 
(4) Ib. $. 4. le enlarged. (d) 
38. $. The Spreading of thefe Vefels is varied, not only accor- 
ding to the Force the Aer hath upon them, but alfo their own greater 
or leß Aptitude to yield thereto. As often therefore, asthey are Slen» 
derer, they will alfo be more Pliable and receflive from the Centre, 
towards the Circumference. Hence, in fuch Roots where they are 
Tab. 2, & 6, all, they ftand more diftant s asin Turnep, Fernfalem Artichoke, Po- 
> 'tato’s, and others; and fo their Braces are fewer: and in the fame 
Root, where they are fmaller, their diftance is greater. Befides, in 
thefe fmaller 4er-Vefels, the Rings being lef, and the Spiral Fibres 
whereof they are made, continuing to fhoot ; the faid Rings therefore, 
muftneeds be fo many more, as they are fmaller; and fo take up more 
(pace by the length of the Root ; and fo, not being capable of being 
crowded in a right line, every Veffel will be forced to recede to a crooked 
or bowed one. 
$. The Sap Vefels,being by the Parenchymous Fibres knit to tefi, 
will likewife comply with Their motion, and fpread abroad with them. 
(e) P.t. 6.3. Yet being (till fmaller (e) and more pliable than the Ae , and fo 
$16, more yielding to the intercurrent Fibres of the Paren byma, their 
TH braced Threds will, fometimes, be much more divaricated, than thofe 
9 ofthe Aer-Vefils; asin Jerufalem Artichoke. And becaufe the Svecifroas 
fels, 
