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20 QUANTITATIVE MICROSCOPY OF PULVERIZED ORES.
BULLETIN 98. Report of the Selby Smelter Commission, by J. A. Holmes, E. C.
Franklin, and R. A. Gould, with reports by associates on the commissioners'
staff. 1915. 525 pp., 41 pls., 14 figs. $1.25.
BULLETIN 108. Melting aluminum chips, by H. W. Gillett and G. M. James.
1916. 88 pp.
BULLETIN 122. The principles and practice of sampling metallic metallurgical
materials, with special reference to the sampling of copper bullion, by Edward
Keller. 1916. 102 pp., 13 pls., 31 figs. 20 cents.
BULLETIN 130. Blast-furnace breakouts, explosions, and slips, and methods of
prevention, by F. H. Willcox. 1917. 280 pp., 2 pls., 37 figs. 30 cents.
BULLETIN 150. Electrolysis of cyanide solutions, by S. B. Christy. 1918.
133 pp., 16 pl., 57 figs. 25 cents.
BULLETIN 171. Tests of a rocking electric brass furnace, by H. W. Gillett and
A. E. Rhoads. 1917. 131 pp., 4 pls., 1 fig. 25 cents.
TECHNICAL PAPER 31. Apparatus for the exact analysis of flue gas, by G. A.
Burrell and F. M. Seibert. 1913. 12 pp., 1 fig. 5 cents.
TECHNICAL PAPER 41. The mining and treatment of lead and zinc ores in the
Joplin district, Missouri, a preliminary report, by C. A. Wright. 1913. 43 pp.,
5 figs. 5 cents.
TECHNICAL PAPER 54. Errors in gas analysis due to the assumption that the
molecular volumes of all gases are alike, by G. A. Burrell and F. M. Seibert.
1913. 16 pp., 1 fig. 5 cents.
TECHNICAL PAPER 60. The approximate melting points of some commercial cop-
per alloys, by H. W. Gillett and A. B. Norton. 1913. 10 pp., 1 fig. 5 cents.
TECHNICAL PAPER 90. Metallurigical treatment of the low-grade and complex
ores of Utah, a preliminary report, by D. A. Lyon, R. H. Bradford, S. S. Arentz,
O. C. Ralston, and C. L. Larson. 1915. 40 pp. 5 cents.
TECHNICAL PAPER 95. Mining and milling of lead and zinc ores in the Wiscon-
sin district, Wisconsinn, by C. A. Wright. 1915. 39 pp., 2 pls., 5 figs. 5 cents.
TECHNICAT- PAPER 109. Composition of the natural gas used in 25 cities, with
a discussior" of the properties of natural gas, by G. A. Burrell and G. G. Ober-
fell. 1915. 22 pp. 5 cents.
TECHNT%AL PAPER 189. Temperature viscosity relations in the Ternary sys-
tem CaO-A1203-SiO2, by A. L. Feild and P. H. Royster. 1918. 36 pp., 1 p1.,
16 figs. 5 cents.
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