utensils, valuable property
of aluminium for, 68
Copper, alloys of aluminium
with, 264-280

deposition of, by aluminium,
81

freeing of aluminium from,
240

oxide, action on aluminium,
87

reduction of aluminium by,
212

of aluminium-sulphide
by, 322

the quality suitable for alu-
minium bronze, 267
Coppering of aluminium, 80
Corbelli, of Florence, cyanogen
process of, 180

process of, for deposit-
ing aluminium elec-
trolytically, 231

Cornwall, supposed discovery of
native aluminium at, 43
Corundum, 49, 50

discovery in Georgia, 49
from Georgia, used by
Cowles Bros., 205
price at the mines, 49

use of, for making alumin-
ium, 37

Cost of aluminium at Salindres
in 1872, 172

tory of, 41

Cowles Bros.' agent in England,

197

aluminium bronze made

by, 274

aluminous materials used

by, 205

owners of a patent for
producing aluminium
chloride, 326

patent claims, 190

process for the reduction
of aluminium by car-
bon, 189-205

Cross, W., description of Ame-
rican cryolite, 48
Crucible clay, action on alumin-
ium, 84

Crucibles, action of aluminium
on siliceous, 259
alumina, use of, for obtain-
ing aluminium, 228
in purifying alumin-
ium, 243

aluminate of soda, use of,
in purifying aluminium,
243

aluminium, use of, for ob-
taining aluminium, 228
earthen, action of aluminium
on, 35

iron, used by Rose, 106

use of, in purifying alu-
minium, 241

lime, for melting alumin-
ium, 36

lining for, 35, 123

porcelain, use of, for obtain-
ing aluminium, 228
used in electrolyzing alu-
minium, 224

Cryolite, Allen Dick's experi-

ments on reduction of, 115
and Beauxite, chief source
of aluminium, 45
stimulated production

Cryolite, composition of, 119
decomposition of, 306
by electricity, 230
Deville's process for reduc-
ing, 119-126.

Dr. Percy's experiments on
reducing, 115
formula of, 44

general use as a flux, 48

H. Rose's paper on reduction
of, 103-115

importation of, by the Penn-
sylvania Salt Co., 48
imports into the United
States, 49

in the United States, 48
manufacture of alumina
from, 146-153
occurrence of, 48, 49
reduction of, 103-129

at Nanterre, 126
by ferro-silicum, 207
Watts's summary of its use,
127

Crystalline form of aluminium,

69

Crystallization of aluminium, 115
Crystallized silicon, 260
Culinary articles, use of alumin-
ium for, 68, 245
Cupellation of aluminium, 71
from lead, 291
Curaudau, reduction of sodium
by, 131

Cyanite, formula of, 44
Cyanogen, reduction of alumin-
ium by, 180

Davy, reduction of sodium by,
131

unsuccessful efforts to isolate
aluminium, 25

Debray, H., aluminium plant at
Glacière, 28

Debray, M., statement of, in re-
gard to iron in aluminium, 282
Decomposition furnace for so-
dium mixture, 134

of aluminium sulphide by
water, 311, 317
Degousse, first successful beater
of aluminum leaf, 58

De la Rive, on the action of sul-
phuric acid on aluminium, 74
Denis, M., of Nancy, remark on
the soldering of aluminium,
248

Density of aluminium, 64
Deposition of aluminium by elec-
tricity, 255

by the battery, 80
electrolytically, 222-234
Deville, aluminium plant at Gla-
cière, 28

analysis of beauxite by, 47
book on aluminium, 1859, 29
charges against Tissier Bros.,
28
conclusion of his book, 30
description of the reduction
of sodium, 132

experiments on gilding and
silvering aluminium, 256
H. St. Claire, first to isolate
pure aluminium, 26
on soldering of aluminium,
247

on the aluminium obtained
by Wöhler, 95

on the casting of aluminium,
237

on the electrolytic reduction

of aluminium, 223, 225
on the melting of alumin-
ium, 235

on veneering with alumin-
ium, 253
purification of aluminium,

238

France, production of aluminium
in, 1882, 39

successful manufacture of
aluminium in, 35
Fremy, original paper on alu-
minium sulphide, 310
Frishmuth, aluminium works in
Philadelphia, 37

analyses of the metal of, 306
improvement of, in making
aluminium-sodium double
chloride, 154

plating with aluminium-
nickel, 234

production of aluminium,
1883, 1884, 40

solders for aluminium by,
250

Frishmuth's first assertions not
verified, 42

patent claims, 178
owners of, 37

process mentioned in Watts's
Dictionary, 42

works, annual production
of, 39

Fritz, Mr., of Bethlehem, Pa.,
interest of, in the mitis process,
287

Fusibility of aluminium, 65
Furnace, Thomson's, 146

Gallium, alloys of aluminium
with, 300

Garnet, formula of, 44
Gases in aluminium, 52

from the electrical furnace,
197

Gaudin, electric process of, 230
Gay Lussac, reduction of sodium
by, 131

Gerhard & Smith, patent process
of, for depositing aluminium,
233

Gerhard, W. F., furnace for re-
ducing aluminium, 127
German silver, aluminium, 277
Germany, aluminium works in,
33

failure of aluminium manu-
facture in, 35

Gila River, N. M., native sul-
phate of alumina on the, 305
Gilding of aluminium, 80, 256
Glacière, process for making alu-
minium, as used at, 98
purification of aluminium
from slag at, 239
Rousseau Bros., aluminium
works at, 28

Glass, action of, on aluminium,

84

Gmelin, an observation on alu-
minium amalgam, 263
Gold, alloys of aluminium with,
298

Gordon, A., on

the tensile
strength of aluminium bronze,
266

Gore, deposition of aluminium
on copper, 234

Granite, composition of, 43
Graphite, carbon changed to,
193

cylinders, use of, to protect
retorts in sodium reduc-
tion, 135

Grätzel, Richard, electrolytic pro-
cess of, 228

Gravity, specific, of commercial
aluminium, 307

Greenland, cryolite in, 48
Grousilliers's improvement of re-
ducing under pressure, 179
Guettier, remarks on aluminium
bronze, 273

Guiana, deposits of beauxite in,
46

Hadamar, analysis of beauxite
from, 47

Hamburg, aluminium works at,
229

Hardness of aluminium, 61
Harmlessness of aluminium salts
to the body, 79

Havrez, P. J., washing appara-
tus of, 149

Heat, conduction of, by alumin-
ium, 67

specific, of aluminium, 68
Helmet, an aluminium, 245

228

into the United States, 47