Since the discussion of my paper, search has been made in specimens of the Knoxville ore for rhodochrosite and for evidences of its crystallization, to confirm the theory of original deposition as carbonate; but no such indications have been discovered. Of course, the agencies which removed the carbonic acid may have destroyed all original forms.

After noting the effect of Knoxville raw and roasted ore on the quicksilver in the pans, we came to the conclusion that the earthy oxides of manganese were the troublesome minerals, and that hard, granular pyrolusite was quite harmless. The expulsion of water of composition from the wad and psilomelane in roasting, destroyed their earthy character, and with it their tendency to foul quicksilver. In conclusion, I take this opportunity to correct one or two annoying errors, which remained in my former paper (Trans., xvii.) by reason of the distance between author and printer, and the miscarriage of some communications by mail. Referring to the volume, the word "chloride," on p. 771, 3d line of 2d paragraph, should be chlorine. On p. 772, 8th line, the phrase "to keep the ore from falling," should be to keep the ore falling; and on the same page, 3d line from the bottom, "waste-building" should be "roaster-building. These errors occur on pages 5 and 6 of the pamphlet edition.

INDEX.

[NOTE. In this Index authors' names are printed in small capitals and the
titles of papers in italics. Casual references, giving but little information, are
usually indicated by bracketed page-numbers.]

ERRATA.

The following errors in the paper of Mr. Furlonge, beginning on page 334 of
this volume, occurred by reason of the impossibility of waiting for the proofs to go
to South Africa to be corrected by the author:

Page 336, line 7 from bottom, microscopic should be macroscopic.

Page 340, line 15 from top, are should be are not.

Page 340, line 11 from bottom, microscopically should be macroscopically.
Page 341, line 12 from top, circular should be acicular.

Page 347, line 13 from bottom, antimony or should be antimony as.
Footnote, page 529. Composition of Various Commercial Aluminums. Mr. A. E.
Hunt desires to say that samples of metal recently received from the Aluminium-
Industrie-Aktien Gesellschaft (works at Neuhausen, Switzerland, and Froges,
Southern France), have been analyzed by Mr. Hendy, chemist of the Pittsburgh
Testing Laboratory, with the following results:

This company should, therefore, be added to the list of four given on pages 528 and
529; and a further addition is now required, namely, that of the Metal Reduction
Syndicate, Limited, the works of which are at Patricroft, near Manchester, Eng.

Page 673. Analysis of Aluminum-Bronze. Dr. Simonds desires the statement
to be added that the determinations of Al in this table are "by difference."

Accident Silver-mine, Iron Hill, Leadville, Colorado, 165.
Accumulators, electrical, 348, et seq.

Adams silver-mine, Carbonate Hill, Leadville, Colorado [172].
ADAMS, W. H.: List of Commercial Phosphates [xxvi], 649.

Additional diaphragm in the Howell roasting-furnace, 223 et seq.

Adelaide fault, Leadville, Colorado, 150.

Aftermath silver-mine, Ten Mile, Summit Co., Colorado [172].

Agassiz silver-mine, Carbonate Hill, Leadville, Colorado [172]

Air: Cost and efficiency of compressed and exhausted air as power-transmitters,
426; Necessity for, in desulphurizing iron-ores, 80, 81 et seq.

Air-blast for separating telluride-dust from crushed ores, 444.

Åkerman On desulphurization of iron-ore, 85; On fusibility of silicates, 744

et seq.

:

VOL. XVIII.-58

AKERS, WILLIAM A., and C. W. GOODALE: Concentration before Amalgamation for
Low-Grade, Partially-Decomposed Silver-Ores, With Notes on the Geology of the Flint
Creek Mining-District [xx], 242.

Alabama Coal production in 1887–88, 124.

Albertite and other bituminous minerals compared, 563 et seq.

Algonquin stamp-mill, Philipsburg, Montana [223].

Allegany County, N. Y. Petroleum and natural gas, 294.

Allerton-Ream gold-mines, Montgomery County, Maryland, 400.

Allison gold-mine, Jackson, Amado County, Cal. [643].

Allison's coal-mines, British Columbia, 315.

Alloys (see the metals).

Alloys, physical tests of: Aluminum and copper, 829 et seq; Aluminum and tin,
828; Aluminum, manganese and copper, 496; Copper and zinc, 822; Lead
and antimony, 820; Lead and tin, 820.

Alumina, electrolysis of, to produce alloys, 666 et seq.

Aluminum Action of corroding agents on, 537; Analysis and physical properties
of, 530 et seq., 824 et seq, 913; Benefits of alloying with silver, 504; Electric
conductivity of, 550; Electric welding of, 532; For instruments of precision,
503; Impurities of, and their effect on, 528 et seq., 551, 822, 833; In cast-iron,
affects carbon, 106; In steel castings, experimental tests of, 851 et seq.; In
wrought-i on castings, prevents blow-holes, 841, and has a useful limit, 849
et seq.; Influence of, on manganese-copper-alloys, 496; Physical tests of, 477,
530 et seq., 822; Reported great strength of, 833; Scheme of analysis for, 559;
Shop-methods for, 477, 554; Works, 107, 530 [824]; (See Errata, p. 913).
Aluminum-alloys: Electrical tests of, 496; Properties of, 494 et seq., 504, 555 et
seq., 673, 828 et seq; Smelting of, by the Heroult process, 666 et seq, 913.
Aluminum and Other Metals Compared (KEEP) [xlvi], 798.

Aluminum-Bronze and Brass as Suitable Materials for Propellers (COWLES, E. H.)
[xlvii], 484.

Aluminum-bronze by the Heroult process, analysis, 673, 913; Physical tests, 674.
Aluminum in Cast-Iron (KEEP) [xxi], 102.

Aluminum in Search of a Nickname (SMITH, O.) [xxxi], 482.

Aluminum in the Drawing-Press (SMITH, ().) [xxxi], 476.

Aluminum in Wrought-Iron and Steel Castings (KEEP) [xlvi], 835.

Aluminium und Magnesium Fabrik, Hemelingen, near Bremen, Germany, 107.
Amalgamation: Details of, 251, 252; Effect of manganese minerals in pans, 911;
Its insufficiency for treating many so-called 'free-milling" ores, 248; Not
applicable to tellurides, 442.
Amalgamation-works (see also Concentration-works, Smelting-works and Stamp-
mills): Montana: Deer Lodge County, Combination Mining and Milling
Company, 242.

Amber and ambrite, place of, among hydrocarbons [582].

American asbestos-mine, Black Lake, Quebec, Canada, 326.

American cannel coal, 436.

Anaconda smelting-works, improvements in, and capacity of, 70.
Analyses (see also Assays).

Analyses of: Albertite, 568, 570.

Aluminum (commercial) 531, 535.

Aluminum-bronze, 557, 673.

Aluminous iron and steel, 558, 541, et seq.

Anthracite producer-gas, 869.

Analyses (continued) of: Asphalt: Cuba: 568.
Bauxite, 562.

Bituminous producer-gas, 869.

Blue-powder (lead-oxide): Missouri: 691, 692.
Bog iron-ore, 268.

Cassiterite, 10.

Coal (anthracite): Canada: Manitoba, Cascade Valley, 314.

Coal (bituminous): Indian Territory: Choctaw coal-field; Lehigh mines, 657,
McAlister bed, 657, Grady basin, 656; Kansas: Carbon, 682; Pennsylvania :
Pittsburgh, 610; Canada: Manitoba, Bow River, 314; Nova Scotia: Cape Bre-
ton, 201 Cumberland County, 201, Pictou County, 201.

:

Coal (cannel): Kentucky: Carter County, Grayson, 437; Hancock County, Breck-
enridge, 437; Johnson County, Chattaroi, 437, Whitehouse, 438; Kanawha
County, Cannelton, 438; Tennessee: Campbell County, Jellico, 438.

Coal (lignite): Canada: British Columbia, Alison's, 315, Hat Creek, 315;
Manitoba-Crowfoot, Galt, Medicine Hat, 314.

Coal (semi-bituminous): Indian Territory: Mitchell basin, 656.
Coal-gas (see also Gas), 881.

Copper-gold-alloy at Argo, Col., 68.

Copper-lead-matte from Argo, Col, 64, 65.

Copper-ore: Nova Scotia: Pictou County, Caribou, 200.

Flue-dust from lead furnaces, Joplin, Mo., 688.

Fuel-gas; 613, 615, 869.

Furnace-gas, 81.

Gas: Coal-gas, 881; Furnace-gas, 81; Natural gas, 881; Producer-gas, 613, 615,
869, 881; Water-gas, 881.

Gold and copper smelting-products, Argo works, Colorado, 64 to 69 passim.
Gold-ores: Huronian ores of Ontario, Canada, 439.

Hessite (silver telluride), 440.

Iron, aluminous, 558, 841 et seq; wrought-iron castings, 839, 857.

Iron-ores: Colorado: Park County, Handcart Gulch (bog-ore) 268; Maine: Pisca-
taqua County, Katahdin, raw and roasted, 309; New York: Essex County, New
Bed (magnetite), 762; Pennsylvania: Berks County, Jones (magnetite), 311, Leba-
non County, Cornwall (magnetite), raw and roasted, 84, 85, 309, 311; Nova Scotia:
Pictou County (clay-iron-stone and black-band), 201, 202; Brookfield, 203.
Jet, 570.

Kaoline, Montgomery County, Md., 406.

Lead: blue-powder from Lone Elm furnace, Mo., 691, 692.

Lead-ores Colorado: Lake County, Leadville, Colonel Sellers mine, 173; Mis-
souri: Jasper County, Joplin, 676, 677, Oronogo, 676; Newton County, Granby,
676, 677.

Lead-smelting products: Lone Elm furnace, Mo., 685 to 692 passim; Argo works,
Colo., 64, 65.

Mill-products: Concentrates and tailings (mill-pulp) from Frue vanners at Com-

bination Mill, 249.

Natural gas, 881.

Petzite (telluride of gold and silver), 439.

Producer-gas, 881.

Pyrites, raw and roasted, 81 et seq.

Quicklime, 682.

Silver-ores of Combination Mine, Deer Lodge County, Montana, 247.

Analyses (continued) of: Slags: Colorado: Argo works (copper-smelting), 63, 64;
Missouri: Lone Elm furnace (lead-smelting), 685 to 694 passim.

Soapstone, Montgomery County, Md., 406.

Steel, aluminous, 558, 841 et seq; Phœnixville, Pa., 88.

Tin-ores: Lode-tin and Stream-tin from Black Hills, S. Dak., 4 to 10 passim.

Torbanite, 577.

Uintaite, 575.

Water-gas, 881.

Zinc-ores, Leadville, Col., 173.

Analysis of aluminum: Scheme for the metal, 559; For aluminum in iron or steel,
560.

Anglo-Canadian asbestos-mine, Black Lake, Quebec, Canada, 326.

Anglo Saxon gold-mine, Calaveras County, Cal. [642].

Anthracite (see Analyses and Coal).

Anthracite coal-area of the United States, 122.

Anthracite-Gas: Analysis, 869; Best coal for making, 879; Its production and fuel-

value, 865, et seq.

Antigonishe County, Nova Scotia, red hematite, 203.

Antimony: Occurrence of, near Garthby, Quebec, 333; Physical tests of, 819; of
alloys, 820.

Antioquia, Dept. of, U. S. Colombia, S. A,, gold-mines, 210.

Appalachian coal-field (bituminous) [123] 124.

Appalachian gold-belt, 396.

Argo works of the Boston and Colorado Smelting Company; classes of ore treated
and methods employed, 61 et seq.

Arizona: Occurrence and treatment of argentiferous manganese-ores in Tombstone
district, 910.

Arkansas: Anthracite [122]; Coal-production in 1887-88, 124; Rush creek, zinc-
ores, 505 et seq.

ARMITAGE, HENRY F., Concentration of Low-Grade Ores [xx], 257.

Arsenic Difficulty of eliminating by roasting, 62, 63, 457; Its interference with
rapid determination of phosphorus in iron, 714; Its peculiar presence in Gilpin
County gold-ores, 449; Test of its effect on gold, 450.

Asbestos-mines and mining in Quebec: 317 et seq.; Black Lake, 323 et seq.; Brough-
ton, 328; Danville, Jeffry, 327; Thetford, 321 et seq.

ASHBURNER, CHARLES ALBERT, Natural-Gas Explorations in the Eastern Ontario
Peninsula [xxv], 290; The Coal-Trade and Miners' Wages in the United States
for the Year 1888 [xxi], 122.

Ashburner, Charles A., Biographical notice of, 365.

Aspen, Colorado, Geology of, 273.

Asphaltic limestones, their occurrence and uses, 577.

Asphaltum and other bituminous minerals compared, 563.

Assay-methods for black-tin, 3 et seq.; Influence of associated minerals on, 43.

Assay methods for tin-slag, 40.

Assays (See Analyses).

Association of Gold with Other Metals in the West (PEARCE) [xxi], 447.

Atlantic Coal Company, Maryland [130].

Avalanches (FERNOW) [xxi], 583 et seq.

Avalanches: Losses by, 583; Conditions of, 585; Protection against, 591; Rescue

from, 595.

A.Y. silver-mine, Iron Hill, Leadville, Colorado, 146 to 176 passim.