And the sides of the said Pores being not smooth, but by the intrusion of the smallest insertions made somewhat rough; by that means the higher and more facile ascent of the _Sap_ therein will farther be promoted. By all which Advantages the facility and strength of that ascent will be continued higher in the said Pores than in the _Pith_. Yet since this also, as well as that in the _Pith_ will have its term; the _Sap_, although got thus far, would yet at last be stagnant, or at least its ascent be very sparing, slow and feeble, if not some way or other re-inforced. Wherefore, as the _Sap_ moving by the breadth of the _Pith_, presseth thence into the Pores of the _Lignous Body_; so having well fill’d these, is in part by the same Collateral motion disbursed back into a yet higher Region of the _Pith_. By which partly, and partly by that portion of the _Sap_, which in its perpendicular ascent was before lodged therein; ’tis thus here, as in any inferiour place equally repleat. Whereupon the force and vigour of the perpendicular motion of the _Sap_ herein will likewise be renew’d; and so its Collateral motion also, and so its pressure into the Pores of the _Lignous Body_, and consequently its ascent therein; and so by a pressure from these into the _Pith_, and from the _Pith_ into these reciprocally carried on, a most ready and copious ascent of the _Sap_ will be continued from the bottom to the top, though of the highest _Trunk_. _An Appendix._ _Of Trunk-Roots and Claspers._ The distinct Parts whereof these are constituted, are the same with those of the _Trunk_, and but the continuation of them. _Trunk-Roots_ are of two kinds: Of the one, are those that vegetate by a direct descent: The place of their Eruption is sometimes all along the _Trunk_; as in _Mint_, &c. Sometimes only at its utmost point, as in the _Bramble_. The other sort are such as neither ascend nor descend, but shoot forth at right Angles with the _Trunk_; which therefore, though as to their Office, they are true _Roots_, yet as to their Nature, they area _Middle thing_ betwixt a _Root_ and a _Trunk_. _Claspers_, though they are but of one kind, yet their nature is double; not a mean betwixt that of the _Root_ and that of the _Trunk_, but a compound of both; as in their Circumvolutions, wherein they often mutually ascend and descend, is seen.