Page:Cyclopaedia, Chambers - Volume 1.djvu/908

 GLA

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GLE

txtajffo are laid horizontally on the laft, or uppermoft Layer of Plaifter, or Lime.

This firft Row of Glafs they cover over with aLayof the fame Powder, an Inch deep 5 and over this Jay another Range of Glajfes : And thus alternately, till the Pan is quite full; taking care that the whole Heap always end with a Layer of Plaifter.

The Pan thus prepared, they cover up the Furnace with Tiles, or a fquare Table of earthen Ware, clofely luted all round; only having five little Apertures, one at each Corner, and another in the Middle, to ferve as Chimnies.

Things thus difpofed, there remains nothing but to give the Fire to the Work. — The Fire for the two firft Hours, mull be very moderate ; and to be increas'd, in proportion as the Co&ion advances, for the fpace often, or twelve Hours ; in which Time it is ufually compleated. At laft, the Fire, which at firft was only of Charcoal, is of dry Wood: So that the Flame covers the whole Pan, and even iffues out at the Chimnies.

During the laft Hours, they make EfTays from time to time; by taking out Pieces laid for the purpofe, thro' the little Aperture of the Furnace, and Pan, to fee whether the Yellow be perfect, and the other Colours in good Order. When the Annealing is thought fufEcienr, they proceed with great Halle to extinguifli the Fire, which otherwife would foon burn the Colours, and break the GlaffeS. —

Glasses are diftinguifh'd with regard to their Form, Ufe, &c, into various Kinds ; as,

Drinking Gloffes, Optic Glajfes, Looking Glaffes, Slim- ing Glajfes, &c.

'Drinking Glasses are fimplc Veffels, of common Glafs or Cryftal, ufually in form of an inverted Cone.- —

Each Glafs confifts of three Parts, viz. the Calix, or Bowl ; the Bottom ; and Foot; which are all wrought, or blown fcparatcly.

Nothing can be more dexterous, and expeditious than the manner wherein thefe Parts arc all blown : two of them open'd, and all three joln'd together. An Idea is only to be had thereof, by feeing them actually at work.

The Glaffes chiefly ufed in England, are made of the Allies of Fern ; Cryftal Glaffes, being grown into Difefteem. The exceeding Brittlenefs of this Commodity, notwithstand- ing theeafy Rate of each Glafs, renders the Confumption hereof very considerable.

Optic Glasses, are thofe made of ufe to Strengthen, im- prove, or preferve the Sight. See Optic Glafs.

To this Clafs belong,

Convex Glasses Concave Glasses Lenticular Glasses Menifcus Glasses, &c. ''Plain Glasses^

> fee

• Convex. \ Concave. ^Lens.

/ Meniscus, ckc. ^Plain Glafs.

'To find the Foci of Optic Glasses, fee Focus.

■ fee

- fee<

- lee-

Telescope. ^Object Glafs. JJLtn-Glafs, ^Magnifying. / Multiplying. ^ Perspective.

Looking Glafs- 7 fee alfo Mirror. Burning QlafSi fee alfo Mirror. Weather Glafs, Cupping Glafs. Window. Drop. Body.

Telefcope Glasses Object Glass Eye Glass Magnifying Glass Multiplying Glass 1 > erjpe£five Glass Looking Glass Burning Glass Weather Glass Cup-ping Glass Glass Window Glass Drop Glass Body

GLAUCOMA, in Medicine, a Difeafe of the Eye, where- in the cryftalline Humour is turn'd of a greenifh, or Azure Colour, and its Tranfparency thus dimini/h'd. See Eye, and Crystalline.

Thole in whom this Difbrder is forming, difcover it hence that all Objects appear to them as thro' a Cloud or Mift: When entirely form'd, the vifual Rays are all intercepted, and they fee nothing at all.

It is reckon'd incurable, when inveterate, and in aged Pcrfons: And even under other Circumftances, is very diffi- cult of Cure ; Externals proving of little Service.

The Internals beft fuited to it, are thofe ufed in the Gut- ta Serena. See Gutt a ferena.

Jul. Ccefar Claudinus, Conful. 74. gives a Remedy for the Glaucoma.

The Word comes from the Greek y^a-v^, glaums, c<ff- fius, fea-green.

The Glaucoma is ufually diftinguifh'd from the Catara£t or Suffufion, in this, that in the Cataraft the Whitenefs ap- pears in the Pupil, very near the Cornea, but fhews deeper in the Glaucoma.

Some late Fnneh Authors, however, maintain the Cata- ract and Glaucoma to be one and the fame Difeafe. — Ac- cording to them, the Cataract is not a Film, or Pellicle form'd before the Pupil, as had always been imagin'd$ but an Al-

teration of the Humor itfelf, whereby its tranfparency is prevented; which brings the Cataracl to xhcGlauccma. See Cataract.

GLEAM, is popularly ufed for a Ray, or Beam of Light. See Ray.

Among Falconers, a Hawk is faid to gleam, when fhe calls or throws up Filth from her Gorge.

GLEANING, or Glaning, the Aft of gathering, or picking up the Ears of Corn, left behind after the Field has been reap'd, and the Crop carried home.

By the Cuftoms of fome Countries, particularly thofe of Melun, and FJfarapes, all Farmers, and others, are forbid either by themfclves, or Servants to put any Cattle into the Fields, or prevent the gleaning in any manner whatever, for the fpace of 24 Hours, after the carrying off of the Corn; on Penalty of Confifcation, &c.

GLEBE, Gleba, in Natural Hiftory, Chymiftry, £$c. a Clod, or Piece of Earth, containing fome Metal, or Mineral. See Ore ; fee alfo Marchasite, Metal, &c.

The Glebes arc carried to the Forges to be wafTi'd, puri- fy 'd, melted, &c. See Gold, Silver, Iron, ckc.

Glebe, or GLzkndand, is properly us'd for Church-land. Dos vel 'Terra ad Ecclcfiam pertinens. — See Church.

Glebe-land is moft commonly ufed for that Land belong- ing to theParini Church, befide the Tithes; tho' in the more general, and cxrenflve Ufe of the Word, Glebe is applica- ble to any Land, or Ground belonging to a Benefice, Fee, Manor, Inheritance, or the like.

Thus, Lind-ivode, Gleba eft terra in qua confiflit dos Ec- clefi<e ; gencralitcr tamen fumitur pro foto, vet fro terra cidta. —

Thus, in the Civil Law, Slaves were faid to be afFecled to *he Glebe, i. e. went with it, were fold with it, &c. The Right of Patronage fhould be annex'd to aGlebe. See Pa- tronage.

GLEET, in Medicine, a Flux of thin Humor from the Urethra. See Flux, Urethra, ckc.

This, or a Gonorrhoea Simplex, often fucceed the Cure of a Gonorrhea Viralenta, and fometimes remain obftinate, even after the Ufe of a Salivation. See Gonorrhea.

The Gleet may happen either from too great Relaxation of the Glands in the Urethra, or from a Corrofion or Exul- ceration of them. It appears moft frequently after a Go- norrhea has been of long (landing, or ill managed in the Cure 5 as by the Ufe of acrid or corroding Injections, and the like.

The Glands may here alfo happen to be ulcerated by the Matter of the Running, which is often fharp enough for that purpofe.

A Gleet is diftinguifh'd from a Gonorrhea fimplex, not only by the Colour, and Confidence of the Matter evacuated, but alfo by the manner wherein ir comes away : The Mat- ter of a Gleet comes away as well at one time as at another ; but that of a Gonorrhea fimplex chiefly in Erections, and when the Patient goes to ftool. The Matter of a Gleet is commonly brownifh, but that of a Gonorrhea fimplex white. And the Continuance of a true Gleet is unattended with Weaknefs, or other ill Confcquences, and dangerous Symp- toms ; nor does it unfit Men for Procreation, as Gonorrhtsa fimplex will.

An aftringent Regimen is the moft proper in both ; Coffee and Claret are fuppofed proper I iquors in thefe Caies : So are thofe made acid with Juice of Lemmons, Vinegar, %fc.

GLENE, Glena, Glenoides, in Anatomy, a Name given to thofe Cavities in Bones, which are of a middie kind, that is, neither of the deepeft, nor fhallowcft, but in a mean between the two. See Bone.

Thus, the Cavity of the Omoplate, wherein the Hume- rus is received, is a Glene, or Glenoides. See Omoplate.

Glenoides, or Glene, according to Slanchard, ckc. is peculiarly attributed to two Cavities in the lower Part of the firft Vertebra of the Neck.

The Word is Greek, compofed of >Aiini, Eyelid; and *->©-, Form.

GLICYRRHIZZA, or Glycyrrhiza, call'd alfo Ra- dix dulcis, Liquiritia, and Liquorice, a f W eet-tafted Root, of confiderable Ufe in Medicine, aga'mft Coughs, and other Diforders of the Breaft and Lungs.

The Shrub which bears it, is cultivated in divers Parts of England, particularly about ^ontefratl in Torkfinre ; in fome Provinces of France, Spain, Germany, and Mufcovy^ and efpecially in Perfia, where it thrives better than any where elfe ; there being fome on the Banks of the Carafu, Kenki, and Kerni-arpa, who r e Roots are thicker than the Arm 5 and whofe Juice, in refpec/t of Strength, Virtue,^, are pre- ferable to others.

The Root of the Liquorice Plant runs, or fpreads a great way in the Ground, and emerging into Air from Place to Place, produces fo many new Stems, or Plants, few of which rife above five Foot high. Its Leaves are thick, green, fhining, half-round, and glutinous : Its Flower red, like the Hyacinth ; and its Seed contain'd in roundiih Pods.

In