I

I N D

Amber, method os dissolving in expressed

oils-367

More effectual method of dissolving in

oils — —> —-368,606

Advantages of this solution — 369,61 5Varnilhes-366, 614

Anacardium, Staining of linen with itsjuice---328

Annotto, Its preparation-224

Its use in gold coloured varnishes 225

Antimony, Refining of gold by it — i;6Does not make gold completely purei 58

Platina treated with it-560

Platina with its regulus-521, 559

Aquafortis, Preparation of ■— — — 13;

Purification-, 38

Adjustment of its strength for the part-ing assay - IZ9.I40

Recovered after parting-152

Recovered from solution of gold inaqua regia-—-99

Aqua regia, different ways of preparing 96Differences in the volatilizing power ofdifferent aquae region-—too

Arcbet, gives durable blackish stain to mar-ble -43 6

Arsenic, with gold-87

with platina---— 5 > 5 > 559

Method of uniting with difficultly fusi-ble bodies-S 39

•Assaying of gold-127

Cupellation- 29

Parting with aquafortis-135

Further assay, for discovering platina 142

Quantity allowed for an assy-127

A flayers Report of the fineness — 141

Ajlringent matter of vegetables, its general

properties-— 345

Phenomena on mixture with green vi-triol - 346

Differences in the phenomena producedby different astringents — 382, 418

Aurum fulminant, Preparation of 104, 105Its explosive power compared with that

of gunpowder--106

Conjecture on the cause of its strongaction on the body which supportsit-;-107

E X.

The gold recovered —107, iog

Aurum mustvum, Preparation of — — 222

B.

Balances, observations on-543

Equality of the arms not necessary for

their exactness-543

Adjustment of the weights-544

Bariglia, of the fame nature with mineralalcali-396

Bas reliefs of gold, made on works of gold

Baths, chemical, their use — —. — — 3 ,

Sand bath-— — — 8

Water bath-— — — 9

Imperfections of sand and water — 31

Mercurial bath-— — -—31

Compound metalline bath-32

Bellows, for large furnaces —> — — 268for small furnaces — —- — — , z

Wooden bellows-—- —> — 268

their inconveniences —-269

Water bellows-— 269

See Blowing machinesQuantity of air afforded by bellows ofiron furnaces — — — — — .— 282by bellows of the iron finery 282Quantity of air retained in them when

closed-283

Made to deliver nearly all their air 283,

-284

Made to give an equal blast-18

Made to move with less force ——20

Bismuth, melted with platina-509

Worked on a cupel-574

Agreement with lead-j

Bistre, Preparation of —--— — 340

Black bodies receive heat from the fun more

freely than others — —-313

not from common fire —-3,3

Blacknessproduced by absorption of lightz i yBy strong reflexion of light — — 318By the concentration of other colours

-320, 441

By the combination of other colours

-420, 441, 442. 354

By the mutual action of bodies on

mixture —- —-— — 344

By

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