TEL

TEL

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crucible with borax, by which the mercury wasdriven off, and a button of pure gold remained.

(d) To the nitro-muriatic folution c, wasnow added cauftic alkali, by which the oxyd ofiron was thrown down.

(e) The alkaline folution b was accuratelyfaturated with muriatic acid, and then heated,by which a white heavy powder was obtained;which, after being wafhed in a mixture of equalparts of alcohol and water, and then gentlydried, was pure oxyd of Tellurium .

The fecond fubfpecies was treated in the fol-lowing manner.

[a) The finely pulverized ore was digeftedin nitro-muriatic acid till nothing more wastaken up.

(b) The infoluble refidue, confiding ofquartz and muriat of filver, was fufed with fivetimes its weight of carbonated foda, by whichthe filver was obtained in the metallic ftate.

{c) The nitro-muriatic folution being con-centrated by evaporation, was largely diluted byalcohol, upon which the oxyd of Tellurium pre-cipitated; and this being re-diffolved in muriaticacid, was obtained in black metallic flocculi, bymeans of a bar of polilhed iron.

(d) The nitro-muriatic folution c, after re-paration of the tellurium, contained only gold,which was procured by the addition of a folu-tion of green fulphat of iron.

The analyfis of the third fubfpecies wasfomewhat more complicated.

(a) 400 grains of the pulverized ore weredigefted with nitric acid, till every thing folublein this fluid had been taken up.

(b) The nitrous folution was combined withmuriatic acid, as long as any precipitation tookplace; by this there was obtained 51 grs. of awhite powder, of which 43 grs. were again re-foluble in boiling water. The infoluble portion,amounting to 8 grs. was muriated filver.

(c) The folution containing the 43 grs.above mentioned, was concentrated by gradualevaporation, and afforded delicate needleformcryftals of muriated lead.

id) The refidue of a , infoluble in nitric acid,was then treated with nitro-muriatic acid, aslong as any thing was taken up : the folutionwas mixed with the nitro-muriatic folution b,and reduced by evaporation till it ceafed todepofit muriat of lead: 1 1 grs. were thus ob-tained.

( e ) To the concentrated folution d, was ad-ded cauftic potafh in excefs, which threw downa copious blackifh-brown precipitate; this beingfeparated, the alkaline liquor was faturated

with muriatic acid, and the white precipitatethus obtained being again diffolved in muriaticacid, and then precipitated by means of a flickof zinc, afforded 8 5 grs. of metallic Tellurium i

( fj The blackilh-brown precipitate of e wasdiflblved in nitro-muriatic acid, and the liquorwas nearly faturated with cauftic potafh ; ni-trated mercury was then added, till the pre-cipitate began to be white. This precipitatebeing feparated by the filter, and wafhed, thefilter, with its contents, was ignited in a cru-cible, and a little nitre being added, the fire wasincreafed, and a button of pure gold was thusobtained, weighing 50.75 grs.

(g) The remainder of the nitro-muriaticfolution y was faturated with carbonated potafh,and a precipitate was obtained, confifting ofoxyd of manganefe , mixed with carbonatedlime and a little alumine and oxyd of iron.

(h) The infoluble refidue of d, weighing

120.5 grs. and confifting chiefly of quartz, wasgently heated, by which it loft about 1 gr.which was fulphur-. being then mixed with fourtimes its weight of carbonated potafh, and fufed,there was obtained a button oifiver, weighing10.125 £ rs ’

The fourth fubfpecies was analyfed in thefollowing manner.

(a) 1000 grs. of the pulverized ore weredigefted with 10 oz. of muriatic acid, to whichwas added, by degrees, a little nitric acid : this'being poured off, 5 oz. more of muriatic acidwere added, by which every thing foluble inthis menftruum was taken up: to the filteredfolution boiling water was added, to re-diffolvethe muriat of lead which had begun to be de-pofited,

(b) Of the infoluble refidue a part had co-hered into a mafs, and was for the moft partfulphur,weighing 17.5 grs.; being gently ignited,it left behind 3.5 grs. of a blackifh matterwhich was diffolved in muriatic acid, and addedto the foregoing folution. Hence the fulphurof the ore amounted to 14 grs.

(c) The remainder of the infoluble refiduewas for the moll part quartz, and weighed

440.5 grs. Being melted with four times itsweight of carbonated potafh, there appeared,on breaking the mafs, a few globules of filver,amounting to about 2.5 grs. equivalent to 3.5grs. of muriated filver; fo that the quartzozematrix was equal to 437 grs.

(i i) The folution a being concentrated byevaporation, cryftals of muriated lead were de-pofited, to the amount of 330 grs. equivalentto 248 of metallic lead.

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