Page:Cyclopaedia, Chambers - Supplement, Volume 1.djvu/984

 LEA

LEA-

leaf may "be either abrupt/ cirrated, membranaceous m the

petiole, or ftipuUtted. Pinnatifid Leaf expreffes one divided into feveral parts in

form of alas ; or which lias three, four, or more lateral

finus's feparated by long horizontal fegments. Plicated Lz at, one from the bafe or petiole of which there

run at feveral diilanccs veflels or fibres, which extend them-

felves to the extreme fides, and fome of which raife and

others deprefs the difk of the leaf in an alternate order,

making acute angles. Pratrterfs Leaf, precmarfum folium, a leaf which is truncated

and terminated by an acute finus at the fummit. SfyuadriftdlsEA*. See bifid Leaf, fupra. ^tiaiernate Leaves. See ternute Leaves, infra. giuina Folia. See Ternate.

Shiinquangular LEAf, one with ftrait fides and five angles. Shtinqnefoliate Leaf, is a compound leaf of the fame form

with" the trifoliate, but made up of five fegments; fuch are

the leaves of cinquefoil, &e. Quinqucpartite Leaf, one which is feparated into five parts

down to the very bafe, fo as to feem made up of five Sepa- rate leaves till clofely examined. In the fame manner a leaf

is faid to be bipartite, Sec, when it is divided into two,

three, &c. parts. Radical Leaf, that which grows immediately from the root

of a plant not from the italic. Radicant Leaf, one which pufhes out roots from its fummit,

as fome of the ferns do. Radicated Leaf, folium radicatum, one which pufhes out

roots from its difk or lower furface. Ramofe Leaves, thofe which are frill more divided than the

winged or alated leaves, and compofed of one feries farther

in their divifion. Of this fort are the leaves of female fern,

and the like. Or, Ramofe leaf is one which grows not on its main ftalk, but on

its branches. Ramulofe Leaf, a kind of compound leaf, in which there are

feveral foliola fufta'tned on a branched petiole. Reclinate or reflex Leaf", one which has its fummit lower than

its bafe. Reniforra Leaf, one of the fhape of a kidney; or, it is a

leaf of a fuboibicular figure, hollowed a little at the bafe,

but without any angle. Rcpanded Leaf, folium repandum^ a leaf, the border of which

is marked'all round with mort lobes, each making a fegment

of a circle, with obtufe finus's. Ret ufe Leaf, rctufam folium, a leaf whofe extremity is termi- nated by an obtufe line. Revohde Leaf, folium revolutum, a leaf, the upper part of

which rolls itfelf downward. Round Leaf, teres folium, one which is not flatted as moll

are, but is of a cylindric figure, except the point. Rugofe Leaf, that whofe veins are funk deep, and between

which the membranous and flefhy part 'of the leaf rifes in

irregular forms, fo as to give upon the whole a wrinkled

furface. Sagittated Leaf, one formed like the iron head of an arrow.

This is the triangular leaf hollowed at its bafe for the infer-

tion of the petiole. Scabrous Leaf, that which has feveral irregular prominences

on its furface. ,

Semamplexicaide Leaf, one refembling the amplexicauk, but

with its lobes at the bafe too fmall to entirely furround

the ftalk. Seminal Leaf, that which appears firft from the feed of a

plant, and is ufually different from the reft. Serrated Leaf, folium ferratum, that whofe edge or border is

notched like a faw, or furnifhed with points which make

acute angles, and placed one bending toward another, and

all toward the top. Reirorfitm ferratum folium expreffes a leaf whofe edge is fur- nifhed with the fame fort of indentings, but in which they

are turned backwards, or all look toward the bafe of the leaf. Obfolete ferratum folium exprciTes a leaf indented in the fame

manner, but the indentings obtufe and weak. Folium duplicato-ferratum denotes a leaf ferrated as the firft,

but with the ferraturcs large, and their edges ferrated again

with indentings of the fame kind. Sejfile Leaf, one which rifes immediately from the ftalk with- out any pedicle. Simple Leaf, is that which is whole, or not divided to the

middle rib, or feeming made up of different fmaller leaves ; as in fage, mint, feV. Simple leaf is otherwife defined, that of which the petiole car- ries only one. See Petiole. Sinuaied Leaf, one which has a number of finus's on its fides, but theft; feparated by lobes not very long, nor them- felves indented or notched at the edges. Sinuat;-dentatcd leaf expreffes a leaf like the former, but with

the lateral lobes of a linear figure. Retrorfum jinuat am folium, a leaf with finus's at the fides, and with the lobes which divide them, pointed and turned to- ward the bafe like the beards of an arrow-. Sparfe Leaves, thofe which are placed irregularly over the feveral parts of the plant.

Spinoff Leaf, that whofe difk or edge is armed with cartila- ginous points fo firmly affixed, that they cannot be feparated without injuring the leaf itfelf.

Stellate Leaves, thofe which grow more than fix at a joint, and are arranged like the rays of a ftar,

Striated Leaf, one with a number of longitudinal furrows on its furface.

Subroiund Leaf, that approaching to the figure of the orbi- cular leaf, but departing from it, either in being too long, or too broad, or prominent, in fome one or more parts. V id, fupr.

Subtdar Leaf, that which grows at the ramifications, or under that part of the ftalk, from whence there grows one on feveral branches.

Subulated Leaf, one of the fhape of an awl. This expreffes a leaf oblong and narrow, broadeft at the bafe, and thence gradually decreafing, till it terminate in a point.

Sulcated Leaf, one which has a great number of ridges all round it, with obtufe finufes.

Supra decompofite Leaf, one which has the common petiole di- vided more than twice, before it is charged with leaves or foliola,

Ternated Leaf, a compound one, confifting only of three leaves on a common petiole.

Ternate alfo expreffes leaves which grow three at a joint, furrounding the ftalk. When there are four or five, they are called quaterna and quina, and fo on.

Tetragonal Leaf. See Trigonal Leaf, infra,

Tomentofe Leaf, one whofe furface is covered with hairs fo fh art and fine, that the eye does not diftinguifh them fingly, though the leaf in general is evidently downy, both to the fight and the touch.

Triangular Leaf, one compofed of three rectilinear fides, and three angles, the two inferior ones of which- are on a level with the bafe.

TrifidhEAT. See Bifid Leaf, fupra.

Trifoliate Leaf, is a compound leaf made up of fegments placed in the fame order as in the digitated leaf, but thefe fegments are ufually fhort, and are always three in number. Of this fort are the leaves of clover, grafs, i$c.

Trigonal Le af, one much like the triquetrous, only that in this the feveral faces are each hollowed in form of channels, and the ribs are iharp and membranaceous. A leaf that has, inftead of three ribs or edges, four or five, is in the fame manner called tetragonal, pentagonal, &c;.

Trilobous Leaf, one divided into three lobes. This is a leaf divided jufl down to the middle into three parts, which ftand apart from one another, and are furroundedat the edges.

Tripartite Leaf. See Shtinquepartite Leaf, fupra.

Triplicaio-ternatum, or ternato-temaium, a leaf the petiole of which divides three times into three branches, before any leaves or foliola are placed on it.

Triquetrous Leaf, expreffes a leaf which has three faces or fides, all flat. This Is ufualty alfo fubulated, or grows fmaller gradually from the bafe to the point.

Truncated Leaf, that whofe fummit or point feems to have been cut off, or is terminated. by a ftrait line in a tranf- verfe direction.

Tubuhfe Leaf, one which is hollow within, and makes a kind of tube.

Vaglnans expreffes a leaf, the bafe of which is formed like a cylinder, and furrounds the ftalk, as is the cafe in many of the grafies.

Venofe Leaf, that on the furface of which there are a vafl: number of branched vefTels, which frequently unite in an odd manner one with another.

Villofe Leaf. See Pilofe Leaf, fupra.

Undulated Leaf, that whofe exterior part of the difk is of more extent than a circle of the fame diameter, fo that the edges are neceiTitated to rife and fall in a regular manner.

Indian Leaf, in botany. See Tamalapatri.

Leaves, in watchmaking, is ufed for the notches of its pinion. See Pinion, Cycl.

LEAK, at fea, is a hole in the fhip, through which the water comes in. A fhip is faid to fpring a leak when fhe begins to leak, or let in the water.

The manner cf flopping a leak is, to put into it a plug wrapt in Oakum, and well tarred, or in a tarpawlir.g clout, which keeps the water out; or nailing a piece cf fiieet lead on the place.

Seamen fometimes ftop a leak by thrufling a pjece of fait beef into it. The fea water, fays Mr. Boyle a, being frefher than the brine imbibed by the beef, penetrates into its body, and caufes it to fwell fo, as to bear flrongly againft the edges of the broken plank, and thereby flops the influx of the water. — a Works Abr. Vol. i. p. 14.7. A ready way to find a leak in a fhip, is to apply the narrow end of a fpcaking trumpet to the ear, and the other to the fide of the fhip where the leak is fuppofed to he; then the noife of the water ifluing in at the leak will be heard di- ftinclly, whereby it may be difcovered. See Philof. Tranf, N° 201.

LEAO, in natural hiflory, a mineral fubftance approaching to the nature of the lapis lazuli, found in the Eaft-Indies;.

and