BOLES. 9

In a moderate fire it burns to a kind of chocolate colour, acquiring a considerablehardness: And in a very violent one is converted into a spungy, greyish green glass.

It is found in the perpendicular fissures of the rocks, near the gold mines, at Stri—gonium in Hungary, and is imagin’d to be impregnated with the sulphur of gold ;however that be, it is a good Astringent, and a much better medicine in all the inten-tions where Bole is required, than either the red Bole of the fame place, or any thingwe commonly fee in the shops under that name.

7. Bolus flavo rubicunda friabilis levis, quæ Terra flgillata Livonica lutea

authorum.

Light , friable , reddish yellow Bole , calld yellow seal'd Earth os Livonia.

This is the Terra Livonica lutea Sigillata Aldr. Musi Met. 267. Dale Pharm. 17.

It is a pure and perfectly fine Bole, considerably heavy, of a ffattery friable tex-ture, and of a dull dusky yellow, with commonly some faint bluff of reddifhness init, of a very smooth and glossy surface, easily broke between the fingers, and not stain-ing the hands; it adheres strongly to the tongue, is readily diffusible in water, andmelts very quickly in the mouth, leaving no grittyness between the teeth.

The Microscope shews it of an irregular texture, sometimes vein’d, and at othersspotted with small dots of red, tho’ in other masies quite pure, and of an equal yellowthroughout, but with a flight bluff of reddifhness thro’ the whole.

It ferments not in the least with Aqua Fortis.

In a moderate fire it acquires a something harder texture, and darker colour; and ina violent one becomes a pale greyish green glass.

It is dug in the place from which it has its name, and in many other parts of the world;and is esteem'd a better Astringent than most of the other Boles. It is usually broughtto us in pieces of about a dram weight, seal’d with the figure of a church and ascutcheon, with two cross keys. In Spain and Portugal it is also much in use, theygive it there as a Sudorific and Astringent, and make a kind of earthen ware of it, ofwhich they are very fond.

8. Bolus flavo rubicunda densa ponder osa^ quæ Bolus Bohemica authorum.

Firm and heavy reddish yellow Bole , called Bohemian Bole.

This is the Bolus Bohemica Aldr. Musi Met. 271. Bolus Bohemica, Kentm. 7.

It is a very pure and fine Bole, considerably heavy, of a compact but unequal tex-ture, and of a something deeper yellow than the Tokay Bole, with a slight admixtureof reddifhness; it is of a very smooth and shining surface, easily breaking between thefingers, not so readily diffusible in water, or melting in the mouth, as many of theother Boles, but when dissolved, of a fine softness, and leaving no harshness betweenthe teeth.

The Microscope shews it compos’d of an almost infinite number of thin strata, laidregularly on one another; and this not only in particular pieces, but in all I have everhad an opportunity of examining.

It raises no effervescence with Aqua Fortis, and acquires a little hardness, but with-out any change of colour in a moderate fire. In a more violent one it is converted intoa blue coarse glass.

. ft } S dug in Bohemia in several different places, and esteemed an excellent medi-cine in malignant fevers and fluxes of all kinds.

Sect. III. The Red B O L E S.

1. Bolus rubra durisflma , quæ Bolus Armena Avicennæ^ & Bolus

Armena rubra authorum .

Hard red Bole , the Bole Armenk of Avicenna.

T HIS is the Bolus Armena Orientalis. Mont. Exot. 15. Bolus Orientalis. Charlt. y.

Musi Calc. iii. Bolus Armena five Armeniaca Dough Ind. 118. Bolus OrientalisMsLbu dam Armena Worm. Musi 11. Bolus feu Terra Armenia Aldr. Musi Met, 269.Bolus Armenia vera Kentm. 7.

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