Book IL of Roots. 91 
may be feen, So that thefe Roots, as by the Perpendicular Strings, 
which fhoot from them into the Earth, and wherein the Aer-Veffels 
are contracted into their Center, they are Plucked down (4):,So by (a) Pret 
the Aer-Vefels, which ftand nearer the Aer, and more under its At- $.15. 
trative Power (b) they are invited upwards ; whereby they have (b) P. 2. 
neither a/cent nor defcent, but keep level, betwixt both. $. 36. 
49- $. Butifthele Veféls are Contraéed, ftanding either in, or 
near the Centre, and are invefted with a Barque proportionably 
Thick; the Root (triketh down perperdicularly, as doth that of Dan- 
delion, Buglofs, Parfnep, Ec. And therefore the faid Veffels, although 7,5, 7,8. 
they are {pread abroad in the level Roots, yet in the perpendicular ones 
of the fame Plant, they are always contraéted 5 as by comparing the 
Level and Down-right Roots of Ammi, Primrofe, Jerufalem Artichoke, 
Com/lip, and others, ismanifelt. 
50. $. If the Aer Veféls are Contracted, and Environed with a 
greater number of Succiférons, the Root grows deep 5 that is, perpen- yy 
dicular and long. (c) Perpendicular, from the Contraction of the Aer- 2 Sc 
Veffils ; (d) and long, from the Predominion'of the Succiferoms, which (4) p, 2, g; 
in their growth, are extended only by that Dimenfion, as in Liquirifb, 49. 
Eryngo, &c. 
51. $. Ifthe Succiferonsare over proportioned to the Parenchymous 
Parts, but under to the Aer-Vefels 3 the Root is perpendicular ftill, but 
groweth fallow: The Succiferous being fturdy enough to keep it per- 
Pendicular; But the Aer-Veffels having a predominion to keep it from 
growing deep 5 as in Stramonium, Nicotian, Beet, &c. 
52. $. If, onthecontrary, the Parenchymons Parts are predomi- 
nant to the Aer Veffels; and that,both in the Root and Trunk then the 
whole Root changeth place, or defeerds. (e) For the faid Aer-Vefels, Ce) P.r. c.t: 
having neither in the Truzck , nor in the Root, a fafficient Power to 5.10. Libi 
Draw it upwards ; it therefore gradually yields to the Motion of its c.2.9.25,and 
String-Roots; which, as they ftrike into the Soil, Pluck it down after 4: Append. 
them. And becaufe the old Strings annually rot off, and new ones 5:10 P. 4+ 
fücceflively fhoot down into the Grovad, it therefore annually (till de- % 3% 
feendeth lower ; as in Tulip, Lily, &c, may be obferved. 
53- $. Where the Aer-Vefels are much fpread abroad, and alfo zu- 
merous, the Root oftentimes, as to its feveral parts, defcends and afiends 
both at once. So Radifhes and Turneps, at the fame time,in which their 
nether parts defcend 5 their upper, (where the faid Veffls are more 
loofely braced, and fpread more abroad than in the lower parts ) do Tab, 2; 
fiend, or make their Growth zpmard. Hence alfo, the upper part 
of molt young Roots from Seed, afcends: Becaufe the firlt Leaves, be- 
ing proportionably large, and ftanding in a free Aer, the Aer-Vefels 
therein, have a dominion. over the young Root; and fo themfelves 
Yielding to the folicitation of the Aer, upwards 5 they draw the Root, 
1n part, after them. 
54 $. BY THE Situation and Proportions of the Parts, the Age How Roots 
of the Root is alfo varied. For if the Sap-Veffels have the greateft are different 
Proportion, the Root, is Perennial, and that to the fartheft extent, as ly Aged. 
in Trees and Shrubs. Becaufe thefe Veffels containing a more copious 
Oyl; ($) and their feveral Principles being more clofely Concentred, 
a Bea: 
they are lef fübje& toa Refolution, that is, a Corruption or Mortificati- i S 
on bythe Aer, Sa 55.9. 
