API
A R S
( OS )
The respective proportions of metal and oxy-gen in these compounds are the following.
• The second oxyd contains 100. antimony to18.6 oxygen.
The third oxyd contains 100. antimony to,27.9 oxygen.
The fourth oxyd contains 100. antimony to57.2 oxygen.
These three oxyds therefore have their oxygen!n the proportions of 1, IE and 2.
The elements of the first oxyd are not given.It may be presumed (according to the theoryof definite proportions) to contain either 9.5or 9 ^ 3 — 4.65 oxygen to 100. of metal.
The.same author also gives for the elementsof the sulphuret of antimony, 100. of antimonyto 57.25 of sulphur.
Tarlarhed Antimony .— Tartar Emetic.A very elaborate examination of this salt andof the various modes of preparing it, has beengiven by a practical chemist, Mr. R. Phillips, b■who has shewn the great uncertainty of suc-cess in following the mode laid down by theLondon College of Physicians in their lastPharmacopoeia . This uncertainty arises fromthe strong tendency in this metal to pass fromthe state of suboxyd (in which alone it is-soluble in tartar) to that of insoluble peroxyd.Mr. Phillips has given as an improvement inthe'process, the employment of the sub-sulphatof antimony as the base to be afterwards boiledwith a solution of an equal weight of creamof tartar, which crystallizes with the tartarinto the tartarized antimony,, or triple tartriteof antimony and potash. The sub-sulphat isprepared by boiling and evaporating to drynessa mixture of sulphuric acid with about half itsweight of metallic antimony, and afterwardswashing out of the residue all the uncombinedsulphuric acid, leaving a tasteless sub sulphat,in which the oxyd must be at a low state ofoxydation, since it dissolves copiously withtartar and forms with it the tartar emetic.As all tartar contains tartrite of lime, somesulphat of lime is also produced by the acid ofthe sub-sulphat, which partly crystallizes alongwith the emetic tartar, but is separated by asecond solution.
APLOME.
This mineral occurs in rhomboidal dodeca-hedrons of a deep brown colour inclining moreor less to orange, striated externally parallel tothe short diagonals of the rhombs. On ex-
posing fragments of this substance to a brightlight,, indications of laminae may be perceived,the direction of which, combined with that ofthe striae, affords reason for supposing that itsprimitive form is a cube. Its specific gravityis 5.44. It scratches quartz though slightly.Its fracture is uneven, passing into small con-choidal with a moderate lustre. It is opakeand in very minute crystals translucent. Beforethe blow-pipe it is fusible into a blackish glass'.It affords by analysis, according to Laugier ,
40. si lex20. alumine
14.5 oxyd of iron
14 .5 lime
2. oxyd of manganese2. ferruginous silex2. volatile matter
95.0
It occurs in Siberia on the banks of the riverLena.
APOPPIYLLITE. See Ichthyophthal-
mitm. •
ARCTIZITE. See Wernerite.ARENDALITE. See Strahlstein, glassyARGIL, native.
A. small portion of this mineral, not suffi-cient for a regular analysis, was examined byFourcroy, who states it to contain about 24per cent, of sulphate of lime (Ann. de Mus.I. 45); since which it has been formally ana-lyzed by M. Simon of Berlin, and by Bucholz,,with the following results. aSimon. Bucholz.
52.5 — 31.0 alumine-
19.25 — 21.5 sulphuric acid.
0.45 —T 2.0 oxyd of iron0.55 —> lime
0.45 —3 silex
47. — 45. water
100.00 — 99.5:
A RSE NIC .—A RSENIC ATED HYDRO-GEN. ARSENI ATS.
§ 1. Ores of Arsenic.
Mispickel.
Some recent experiments on this ore have-been made by M. Chevreul. k "When mispickelis heated in a glass retort, there rises a subli-.mate consisting of metallic arsenic with a very,small portion' of orpiment, and the residue-
► Experimental Examination of the Pharmacopoeia. a Klapr, E>ict, Chim. art. 4lmme nathe.b Journ. des Mines, xxix. p. ASP.