In the Roots of very many Plants, as _Turneps_, _Carrots_, &c. the _Lignous Body_, besides its main utmost Ring, hath divers of its osculated Fibres dispersed throughout the Body of the _Pith_; sometimes all alike, and sometimes more especially in, or near, its Center; which Fibres, as they run towards the top of the _Root_, still declining the Center, at last collaterally strike into its Circumference; either all of them, or some few, keeping the Center still; of these principally the _Lignous Body_ of the Trunk is often originated. These Fibres, although they are so exceeding slender, yet in some _Roots_, as in that of _Flower-de-liz_, they are visibly concave, each of them, in their several Cavities also embosoming a very small _Pith_; the sight whereof, the Root being cut traverse, and laid in a Window for a day or two to dry, may without Glasses be obtained. And this is the general account of the _Root_; the declaration of the manner of its growth, with the use and service of its several parts, we shall next endeavour. We say then, that the _Radicle_ being impregnate, and shot into the Moulds, the contiguous moisture, by the _Cortical Body_, being a Body laxe and Spongy, is easily admitted: Yet not all indiscriminately, but that which is more adapt to pass through the surrounding Cuticle. Which transient Sap, though it thus becomes fine, yet is not simple; but a mixture of Particles, both in respect of those originally in the Root, and amongst themselves, somewhat heterogeneous. And being lodg’d in the _Cortical Body_ moderately laxe, and of a Circular form; the effect will be an easie Fermentation. The _Sap_ fermenting, a separation of Parts will follow; some whereof will be impacted to the Circumference of the _Cortical Body_, whence the Cuticle becomes a Skin; as we see in the growing of the Coats of Cheeses, of the Skin over divers Liquors, and the like. Whereupon the _Sap_ passing into the _Cortical Body_, through this, as through a _Manica Hippocratis_, is still more finely filtred. With which _Sap_, the _Cortical Body_ being dilated as far as its _Tone_, without a solution of Continuity will bear; and the supply of the _Sap_ still renew’d; and the purest part, as most apt and ready, recedes, with its due Tinctures, from the said _Cortical Body_, to the _Lignous_. Which _Lignous Body_ likewise super-inducing its own proper Tinctures into the said _Sap_; ’tis now to its highest preparation wrought up, and becomes (as they speak of that of an Animal) the Vegetative _Ros_ or _Cambium_: the noblest part whereof is at last coagulated in, and assimilated to the like substance with the said _Lignous Body_. The remainder, though not united to it, yet tinctur’d therein, thus retreats, that is, by the continual appulse of the _Sap_, is in part carried off into the _Cortical Body_ back again, the _Sap_ whereof it now tinctures into good Aliment: So that whereas before the _Cortical Body_ was only