Yet as the _Lignous Body_ is the Principle of Motion in the _Cortical_; so the _Cortical_ is the Moderator of that in the _Lignous_: As in Animal Motions, the Principle is from the Nerves; yet being once given to the Muscle or Limb, and that moving proportionably to its structure, the Nerves also are carried in the same motion with it. We suppose therefore, that as the principal motion of the _Lignous Body_ is in length, so is its proper tendency also to ascend: But being much exceeded both in Compass and Quantity by the _Cortical_ as in the smaller parts of the _Root_ it is; it must needs therefore be over-born and governed by it; and so, though not lose its motion, yet make it that way wherein the _Cortical Body_ may be more obedient to it; which will be by descent: Yet both of them being sufficiently pliable, they are thus capable, where the Soyl I may oppose a direct descent, there to divert any way where it is more penetrable, and so to descend obliquely. For the same reason it may also be, that though you set a _Bean_ with the _Radicle_ upward; yet the _Radicle_, as it shoots, declining also gradually, is thus arch’d in form of an Hook, and so at last descends. For every declination from a perpendicular Line, is a mixed motion betwixt Ascent and Descent; as that of the _Radicle_ also is, and so seeming to be dependent upon the two contrary Tendencies of the _Lignous_ and _Cortical Bodies_. What may be the cause of those Tendencies (being most probably external, and perhaps something of a _Magnetisme_) is besides my Task here to enquire. Now although the _Lignous Body_, by the position and shape of its Pores, principally groweth in length; yet will it in some degree likewise in breadth: For it cannot be supposed that the purest _Sap_ is all received into the said Pores; but that part thereof likewise, staying about its _Superficial parts_, is there tinctur’d and agglutinated to them. And because these Pores are prolonged by its length; therefore is it much more laxe and easily divisible that way; as in slitting a Stick, or cleaving of Timber, and in cutting and hewing them athwart is also seen. Whence it comes to pass, that in shooting from the Center towards the Circumference, and there finding more room, its said original Laxity doth easily in divers places now become greater, and at length in open Partments plainly visible. Betwixt which Partments, the _cortical Body_, being bound in on the one hand, by the surrounding Skin and Moulds, and pressed upon by the _Lignous_ on the other, must needs insert it self, and so move contrary to it, from the Circumference towards the Center: where the said contrary motions continued as begun, they at last meet, unite, and either make or augment the _Pith_. And thus the _Root_ is fram’d, and the Skin, the _cortical_ and _Lignous Bodies_, so as is said, hereunto concurrent. We shall next shew the use of the two other Parts, _sc_. the _Insertment_ and _Pith_; and first of the _Pith_.