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Show The Anatomy BookIV. 15. §. That of Black Poplar, by Three 5 and each Edge by Three repeated. Ontheleft, the Diameter ofthe Firft, isthe Length of the Leaf, of the Second, Half thelength; of the Third, the Length and Half. The Meafure of the right Edge, is that of the. left, Inverted : Book IV. of Leaves, CHAD ay. the fame Meafure there beginning at the Ba/e, and ending at the Cone ; which here'begins at the Cove, and ends at the Ba/e. 16..§. Thatot Doronicum, is meafured by Three Circles, whereof, one isrepeated Once3 and another Thrice. The right Edge by Two, and One repeated. For the Diameter ofthe Firft or that next the Coxe; is the Length of the Leaf’; the next is the fame, but drawn Outward; the Diameter of the Third, ‘is’ Half the Length. The left Edge, by Three Circles ; whereof One ’is repeated on the fame Edge, and Two, the fame, as onthe other. For the Diameter of the firft, isthe Length Of the-Parts and Texture of the. Leaf. COME next to obferve the feveral Parts, where- of the Leaf is compofed: and firft the skiz. This being ftript off the Leaf, although to the bare Eye it looks no otherwife than,a shin of Ifnglafs: yet being viewed through a good Glu, with a clear andtrue Light, and in an advantagious Pofition; it of the Leaf; of the Second, Four times the Length 5 the Third, the fame as the Firft; and of the Fourth, Half the Length. 17. §. Laftly, that of Mountain Calamint is meafared by Four Circles.” The lett Edge, by Three Circles, of which, the lowermoft is oncerépeated : the right Edge alfo by Two ; whereof the nether i likewife once repeated. 18. §. Itmay feem, even from thefe Inftances, no very unobvious Conclufion 5 That all Crooked Lines, Spiral, Helick , Elliptich , Eiyperbo- lick, Regular, or Irregular 3 are made up of the Arches, of Circles, having either the fame; or divers Centers and Diameters. And, as otherwife, fo from the Contemplation of Plants, men might firft be invited to asa- thematical Enquirys. 19. §. TOGETHER with the Figure of the Leaf, the Pofition of the Fébers, as it is apparent before Diffection,is obfervable; efpecially onthe back of the Leaf: Whereof I thall add, to what I have faid in the Firft aok, the following Remarques. 20. §. Firft, that there are fome Leaves, in which the firft Colla- teral Fibres make Right Angles with the Great one in the midle: as the is, of Parenchymous and Lignous Fibres, all very curionfly interwoven as it were, into a piece of admirably fine white Sarcenet ¢ as in Flag, Tub. 48 Tulip, and the like. 2. §. From hence, it is eafy to conceive how the Shins of all Plants, as well asthofe of Avimals, are perfpirable; fc. between the feveral Fibers of which they confift. But as the Skins of Animals, efpecially in fome Purts, are made with certain open Pores or Orifices; either for the Reception, or the Elimination of fomethingfor the benefit of the Body: fo likewife the Skins, of at leaft many Plants, are formed with feveral Orifices or Pa/s-ports, either for the better Avolation of Superfluous Sap, or the Admiffion of Aer, 3. §. THESE Orifices are not in all Leaves alike 5 but varied in Bignefs, Number, Shape, and Pofftion : Serving to the different Nature of the Plant,or Leaf; and giving the Leaf, as it were,a different Grain, Great-Maple, the Great Celandine, Chondrilla, and the reft, or many, of the Ivtybous Kind ; with fome few others, But that generally all the chief Fibers of a Leaf, make Accute Angles together: both where they {tand collateral with the midle Fiber, as in Strawberry 3 and where they all part at the Sta/k, as in Mallow. 21. §. Again, that of thefe, there are fome few, any two of whofe a good Gla/s, all over the Leaf, but notin any regular Order. Thefe Orifices are the caufe of the Greyifh Glo/s on the upperfide the Leaf’: Partofa Circle, as in’ MaWow andin fome one Tenth: but in moft Sea-Green. Phsé Defining Fibres making two Rays of equal Length, take in One Eighth 47: appears to confift not only of Organical Parts, ag do the skias of Animals 5 but thefe alfo Regularly mixed together5 that they take in cither one Twelfth, part, as in Holy-Oak5, or oneSixth , as in Sirynga. So that wherethe Fibres ftand ‘Collateral with one in the the midle, if you fuppofe them to be drawn out at Oppofite Angles 5 or wherethe chief F7bers part at the Stalk , you only takein the stalk 5 you will thereby divide a Circle into Eight, Twelve, or Six equal Parts; asin Sirynga, the Vine and others. And fo likewife, where there are feveral Sprigs upon one Stem, as in Feil, Hemlock, and the like: as will beft be underftoodby the Figures. Princes Feather, i.e. a Sort ofSanicle, they {tand only on the Edges ofthe Leaf; but are very ample. Inthe White Lily, they are Oval, very white, and each furrounded with a flender white Border, They ftand about a 6" or 8th part ofan Inch diftant,as they appear through Tab, 48. for the Back-fide, in which there are none of them, is of a dark 4. §. Inthe Leaf of Pine, they are alfo Oval, and about the fame Bigne/s and Number, asin that of a Lily; yet without a Border. But their Pofition is very Elegant, ftanding all, moft exactly, in Rawk and Tab. 48: File from oneerid of the Leaf to the other. 5. §. NEXT TO the skin,lies the Pulpy part of the Leaf’; which by the famelatitude, as‘Uye hath taught us in many other Words, I call the Parenchyma. This Parenchyma or Pulp of the Leaf, like the Pith, and all other Parenchymous Parts of a Plant is made up of in- comparably fimall Cylindrick Fibres: and thefe Fibres, in moft Leaves, woven and woun'd up into little Bladders. 6. §. The Bladders are here of feveral Sizes, as inthe Pith: but generally morevifible in the stalk, than in the Body of the Leaf: Va- Th, 49. ried, as in the Pith, fohere, not according to the Size, but the Nature of the Leaf. So in Common Dock, and Moth Mullein, both Great Cc CAVES, i! i ih H |
