The Anatomy Book I. 
25. $. _ Yet as the Lignous Body is the Principle of Motion in the 
Cortical ; fo the Cortical is the Moderator of that in the Lignous: As in 
Animal Motions, the Principle is from the Nerves; yet being once gi- 
ven tothe 24yfcle or Limb, and that moving proportionably to its ftru- 
ure, the Nerves alfo are carried in the fame motion withit. We fap- 
pofe therefore, that as the principal motion of the Lignous Body is in 
length, {ois its proper tendency alfo to Afcend. But being much exceed- 
ed both in Compaís and Quantity by the Cortical, as in the finaller parts 
of the Root it is; it muft needs therefore be over-born and governed 
by it; and fo, though not lofeitsmotion, yet make it that way where- 
in the Cortical Body may be more obedient to it 5 which will be by de- 
feent. Yet both of them being fufficiently pliable, they are thus capa- 
ble, where the Soyl may oppofe a direét defcent, there to divert any 
way, where it is more penetrable, and fo to defcend. obliquely. For 
the fame reafon it may alfo be, that though you fet a Bea» with the 
Radicle upward; yet the Radicle, as it fhoots, declining alfo gradu- 
ally, is thus arch’d in form of an Hook, and fo at laft defcends. For 
every declination from a perpendicular Line, is a mixed motion be- 
twixt Afcent and Defcent , as that of the Radicle alfo is, and fo feem- 
ing to be dependent upon the two Contrary Tendencies of the Lignous 
and Cortical Bodies. What may be the caufe of thofe Tendencies (be- 
ing moft probably external, and a kind of Maguetifme) I hall not make 
my Task here to enquire. 
26. $. Now although the Lignons Body, by the pofition and fhape 
of its Pores, principally groweth pa es yet will it in fome degree 
likewife in breadth: For it cannot be fuppofed that the pureft Sap is 
all received into the faid Pores; but that part thereof likewile, ftaying 
about its Superficial Parts, is there tinétur'd and agglutinated to them. 
And becaufe thele Pores are prolonged by its lengths therefore it is 
much more laxe and eafily divifible that ways as in flitting a Stick, or 
cleaving of Timber, and in cutting and hewing them athwart is alfo 
feen. Whence it comes to país, that in fhooting from the Center to- 
wards the Circumference, and there finding more room, its faid origi- 
nal Laxity doth eafily in divers places now become greater, and at 
length in open Partments plainly vifible. Betwixt which Partments, 
the Cortical Body, being bound in on the one hand, by the fürround- 
ing Skin and Moulds, and prefled upon by the Lignous on the other, 
mutt needs infert it (elf, and fo move contrary to it, from the Circum- 
ference towards the Center. Where the (aid contrary motions continu- 
ed as begun, they at laft meet, unite, and either make or augment the 
Pith. And thus the Root is fram’d, and the Skiv, the Cortical and 
Lignous Bodies,fo asis faid,thereunto concurrent. We (hall next thew the 
ue ok the twoother Parts, fe. the Infertment and Pith; and firft of the 
Pith. 
27. $. ONE true ufe of the Pith is for the better Advancement of 
the Sap, whereof I fhall fpeak in the next Chapter. The ufe I here 
obferve, is for the quicker and higher Fermentation of the sap: For 
although the Fermentation made in the Cortical Body was well fubfer- 
vient to the firft Vegetations, yet thofe more perfeét ones in the Trunk 
which after follow, require a Body more adapted to it, and that is the 
Pith 5 which is fo necelläry, as not to be only common to, but con- 
fiderably large in the Roots of molt Plants; if not in their inferiour 
parts, 
