And for Knots, they are so necessary, as to be seen not only where collateral Branches put forth; but in such Plants also as shoot up in one single _Trunk_; as in _Corn_; wherein, as they make for the strength of the _Trunk_; so by so many percolations as they are Knots, for the transmission of the _Sap_ more and more refined towards the Ear. So that the two general uses of Knots are for firmer standing, and finer growth. Lastly, as the due Formation and Nutrition of the _Germen_ are provided for, so is its security also; which both in its position upon the _Trunk_, and that of its Parts among themselves may be observed. The position of its Parts shall be considered in speaking of the Leaf. As to its standing in the _trunk_, ’tis alwayes betwixt the _trunk_ or _Elder Branch_, and the _Basis_ of the Stalk of the _Leaf_; whereby it is not only guarded from the Injuries of any contingent Violence, but also from the more piercing assaults of the Cold, so long till in time ’tis grown, as larger, so more hardy. The manner and uses of the position of every _Germen_, considered as after it becomes a _Branch_, hath already been by the Ingenious Mr. _Sharrock_ very well observed; to whom I refer. Upon the prolongation of the _Germen_ into a _Branch_, its _Leaves_ are thus display’d. The Parts whereof are substantially the same with those of a _Branch_: For the Skin of the Leaf is only the ampliation of that of the _Branch_; being partly by the accretion of new, & partly the extention of its already existent parts (dilated as in making of _Leaf-Gold_) into its present breadth. The Fibres or Nerves dispersed through the Leaf, are only the Ramifications of the _Branch_’s Wood, or _Lignous Body_. The _Parenchyma_ of the Leaf which lies betwixt the Nerves, and as in Gentlewomens Needle-works, fills all up, is nothing else but the continuations of the _Cortical Body_, or inner part of the _Barque_ from the _Branch_ into it self, as in most Plants with a fat Leaf, may easily be seen. The Fibres of the _Leaf_ neither shoot out of the _Branch_ nor _Trunk_, nor stand in the _Stalk_, in an even Line; but alwayes in either an Angular or Circular posture, and usually making either a Triangle, or a Semi-Circle, or Cord of a Circle; as in _Cycory_, _Endive_, _Cabbage_, &c. may be observed: And if the Leaf have but one main Nerve, that also is postur’d in a Circular or Lunar Figure; as in _Mint_ and others. The usual number of these Nerves or Fibres is 3, 5, or 7. See the _Figures_ from 20, to 29. The reason of the said Positions of the Fibres in the _Stalk_ of the _Leaf_, is for its more erect growth, and greater strength; which, were the position of the said Fibres in an even Line, and so the Stalk it self, as well as the Leaf flat, must needs have been defective; as from what we have said of the Circumferential posture of the _Lignous Body_ in the _Trunk_, we may better conceive.