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Show The Anatomy ook [V- Book IV. of Leaves: Kcr 7- §. CHAP ok Of thofe things which appear upon the Surface of the Leat. Hi Hit; i fi | =SHES E are Globular Excrefcences, Spots, Hairs, “oye AV Thorns and Prickles : of all which, except Spots, eo I have {poken in the Appendix to the Chapter of Leaves in the Firft ook, 2. §. Ofthe Globulets, it may here be further noted, That thofe which are white,andlie fometimes like a fine Powder upon the Leaf, i * were oncetranfparent, as in Bears-Eear ; their : cleer Liquor beeing now evaporated to anExtrad or This, if licked off, will give you the Taft of the more Effential Content of the Plant 5 different from that perceived in chewing the Leaf: WT : ee il 3. §. For the obferving of them, it may alfo be noted, That although they often grow on both fides the Leaf alike ; yet fometimes, as in Ground-Ivy, onlyor chiefly on the Back-Side. And that in many Plants,where the elder Leaves have none 5 on the young Buds they are very numerous 5 as in Corin Tree, Sorrel, and others. 4. §. AS for spots, the {maller ones are obfervable not only in St. Fohns-worts, (in which Plant only they are commonly taken notice of ) but alfo in Rue, Ground-Ivy, Pympernel or Anagallis, and divers other Plants, when held up againft the Light. The original whereof feems to be, at leaftinfome, from the Globulets above mentioned; that is, when they break and dry away. Sothe Spots of RueLeaves,whichin the Reflection of Light look black ,but upon the Trajeci- on thereofare tranfparent , are fo many little Holes, pounced half way throughthe thicknefs of the Leaf, and feem as made, by the breaking and drying away of as many Globulets. Whencealfo, as the Globulets are beft {cen in the younger Leaves, fo thefe Spots in the elder. 5. § BESIDES thefe, and fome others (as thofe in LadiesThifile) which are Natural to the Leaf there are alfo fome Spots, or rather Streaks, which are Adventitious 5 asthofe in the Leaves of Son- chws. The Caufe whereof, isa {mall flat Infe#, of a grey Colour, and about th of an Inch long. Which neither ranging in bredth, nor ftriking deep into the Leaf; eats fo much onlyas lies juft beforeit, andfo runs {cuddingalong betwixt the skiz and the Pulp of the Leaf 5 leaving a whitifh Streck behind it, where the Skiz is now loofe,as the meafure of its Voyage. 6. §. THE Original and feveral kinds of Thorns, I have defcrib’d im the above faid Appendix. I only add, that the very Leaves of fome Plants, if they ftandtill the fecond year, are changed into fo many Thorns, asin the Furz, 7. §. Theyare of Ufe, not only for the Protection of the Bad; but likewife, forthe fupport of the Plant 5 as is ob{ervable inthole Climbers, which are neither {trong enoughto ftand of themflves ; nor yet, their fragility, are capable of winding about another, without froma being torn all to pieces. For which end alfo, thefe Thorns grownot like Buds, ereteds but poynt all downwards, like fo many Tevters or Hanging-hooks : as in the Bramble, chiefly on the Stalks 5 and in Clivers, Tab, 43. alfo on the Leaves themfelves ; whereby they catch at any Thing that ftands next them; and fo, although fuch flim and feeble Plants, yet eafily climb to a very great hight. & §. OF THE feveral Figures of Hairs, and their Uf, have B. 1.Cé,4, alfo fpoken. As to one Ufe, fc. the Protection they giveto theI Lesf I thall here further note, That the defign of Nuturé, is the more evi- Tab, 43. : dent if we confider, That all Leaves are not. alike Hairy, nor at all times, nor in every part : but differently, according to their-Age, Sub- Stance, Texture, and Foulding up. Their Ages for there are many young Buds covered witha thick warm Hair, which afterward s dries up anddifappears, as ufelefs; as thofe of the Vine, Golden Liverwort , &c. Their Subftance; fo thofe Buds whichare tendereft, and would fooner feel the cold, if naked, have the fulleft Hair; as of Thiftle, Mullen, Burdock, and others. Their Struéfure 5, therefore tho Leaves, whofe Fibres ftand more prominent or above their Surface, left the cold fhould nip them, are covered with greater Store of Hair; as in Moth- Mullen, Garden-Clary, and the like. And their Fouldsit being obfervable, That thofe Leaves which are folded up inward, or no fair on their inner, but only on their Back-Sides, open to the Aers as is vifible in Corin, Warden, Golden, and others. g. §. Add hereto, That where there is Store of Hair, havelittle which are Liverwort, Nature is thelef follicitous for other Covers 5 and wherethereis not, {heis more. So the Leaves of Beans and Peafen, of Nettle, Plantain, &c. not being Hairy, have each a Surfoyl, or elfe certain Hairy Thrums, to proted them. And thofe Plaats which have neither, are fuch as have.a Hotter Fuyce, and folefs fubjec to the impreffions of Cold, as Speermort, Scurzygrafi, Watercrefi, Fenil, and moft of the Umbelliferous Kind. 10. §. Hairis of ufe to preferve young Byds, not only, from the cold der, but alfo from too much Wet; which, if it were contiguous; efpecially in Winter, would often rot and deftroy them. But being madeto {tand off in drops at the ends of the Hair, doth not hurt, but refreth them, Thus doth Nature make the meaneft Things fometimes fubferve to the beft Ends, |