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INDEX TO VOLUME X.

SUBJECTS.

ABSOLUTE Wave-length, Corrections to Determinations of. Edwin
B. Frost

ALGOL Variable in Cygnus, New. Edward C. Pickering

Type Variable Stars, Densities of.
› ANDROMEDAE, Variable Velocity of.
ANNULAR Nebula HIV. 13, in Cygnus.
ARC-SPECTRUM of Vanadium.
BINARY, Spectroscopic, Capella.

BLACK BODY, Distribution of Energy in Spectrum of. F. Paschen
Spectral Energy-Curve of. Frank W. Very

BOARD of Visitors to Naval Observatory, Recommendations of.
BRIGHTNESS, Relative, of Mars and Jupiter.

J. Hartmann

PAGE

283

126

Henry Norris Russell

315

W. W. Campbell

178

James E. Keeler

266

B. Hasselberg

343

W. W. Campbell

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177

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Frank H. Bigelow
H. K. Palmer

220

246

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BUNSEN, Robert Wilhelm. Henry Crew
CAPELLA, Spectroscopic Binary. W. W. Campbell -
B CAPRICORNI, Variable Velocity of. W. W. Campbell
CARBON in the Chromosphere. George E. Hale
CHROMOSPHERE, Carbon in the. George E. Hale
CLOUD Conditions of Eclipse Track of 1900.
CLUSTER Messier 13, Distribution of Stars in.

Messier 5, Periods of Variable Stars in.

COMET Spectra. W. H. Wright

COMPARISON Spectrum, Titanium for. Edwin B. Frost
CONCAVE Grating Spectroscope. S. A. Mitchell

CONFERENCE, Third, of Astronomers and Astrophysicists. George C.

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DENSITIES of Algol Variables. Henry Norris Russell

DISTRIBUTION of Energy in Spectrum of Black Body. F. Paschen of Stars in Cluster Messier 13, in Hercules. H. K. Palmer DOUBLE Stars, Density of. Alexander Roberts

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ECLIPSE Track of 1900, Cloud Conditions of. Frank H. Bigelow
of 1900, Report of Committee on. G. E. H.

ELECTRIC Spark, Pressure in. John Fred Mohler
ELEMENTS of a Parabolic Orbit. F. R. Moulton

ENERGY, Distribution of, in Spectrum of Black Body. F. Paschen
ENERGY-CURVE, Spectral, of a Black Body. Frank W. Very
FOURTH Type Stars, Spectra of.

Ellerman

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George E. Hale and Ferdinand

87

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HERCULES Cluster Messier 13, Distribution of Stars in. H. K. Palmer
HYDROGEN Lines, Effect of Pressure upon. J. Wilsing

246

269

IMPURITIES in Spectra of Gases. Percival Lewis

137

INTERPRETATION of Spectrum of New Stars. J. Wilsing
JUPITER and Mars, Relative Brightness of. J. Hartmann
KEELER'S Photometric Researches on Orion Nebula. J. Scheiner
KRYPTON, Spectra of. C. Runge

113

225

164

73

LEONIDS, the 1898, Photographic Observations of. W. L. Elkin
← LIBRAE, Variable Velocity of. W. W. Campbell
LIGHT Curves of Variable Stars, Visual and Photographic. S. I.
Bailey -

25

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178

261

LINE of Sight Constants for the Principal Stars. Frank Schlesinger -
Velocity for Determination of a Parabolic Orbit. F. R. Moulton -
Variable Velocities of e Librae, h Draconis, λ Andromedae, e Ursae
Minoris and Draconis in. W. W. Campbell
Variable Velocity of a Ursae Minoris in. IV. W. Campbell
Variable Velocities of 8 Capricorni and v Sagittarii in. W. W.
Campbell

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MARS and Jupiter, Relative Brightness of. J. Hartmann

225

NOVEMBER Meteors of 1899.

MESSIER 13, Distribution of Stars in Cluster. H. K. Palmer

5, Periods of Variable Stars in Cluster. METEOR Photography. Josef Jan Fric

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S. I. Bailey

METEORS, November 1899. Edward C. Pickering

MILKY Way, Position of Third and Fourth Type Stars in reference

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ORBIT, Elements of a Parabolic. F. R. Moulton
ORION Nebula, Keeler's Researches on. J. Scheiner

PAGE

246 255

130

221

169 164

James E. Keeler

167

193

266

113

Edward C. Pickering

285

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164

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PERIODS of Variable Stars in Cluster Messier 5. S. I. Bailey
PHOTOGRAPHIC Observations of the 1898 Leonids.

PHOTOGRAPHIC Methods, Keeler's Photometric Researches on Orion

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Determination of Stellar Parallax by Means of. Frank Schles-
inger

242

PHOTOMETER, Measurements of Mars and Jupiter with a New. J.

Hartmann

225

New Photographic. J. Hartmann

PHOTOMETRIC Researches on Orion Nebula, Keeler's. J. Scheiner

J. Hartmann

PLANETS Mars and Jupiter, Relative Brightness of.
POLARIS, Variable Velocity of. Edwin B. Frost
POSITION of Stars of the Third and Fourth Types. T. E. Espin
PRESSURE in the Electric Spark. John Fred Mohler

Effect of, upon Wave-lengths of Hydrogen Lines. J. Wilsing

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225

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PURKINJE Phenomenon in Observations of Faint Spectra. W. W.

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RECOMMENDATIONS of the Board of Visitors to the United States

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SPECTRA, Purkinje Phenomenon in Observations of Faint. W. W.

Campbell

of Krypton. C. Runge

of Stars of Secchi's Fourth Type. George E. Hale and Ferdi-
nand Ellerman

of Gases, Impurities in. Percival Lewis

of Comets. W. H. Wright

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SPECTRAL Energy-Curve of a Black Body. Frank W. Very
SPECTROGRAMS of a Orionis. Henry Harrer
SpectroheliOGRAPHS, Some New Forms of. George E. Hale
SPECTROSCOPE, Concave Grating. S. A. Mitchell

of Fixed Deviation. Ph. Pellin and André Broca SPECTROSCOPIC Binary Capella. W. W. Campbell ·

SPECTRUM of Black Body, Distribution of Energy in. F. Paschen

of New Stars, Interpretation of. J. Wilsing
Comparison, Titanium for. Edwin B. Frost

of Hydrogen, Effect of Pressure upon. J. Wilsing

of P Cygni. A. Bélopolsky

Arc, of Vanadium. B. Hasselberg

STARS, Line of Sight Constant for the Principal. Frank Schlesinger of Secchi's Fourth Type, Spectra of. George E. Hale and Ferdinand Ellerman

New, Interpretation of Spectrum of. J. Wilsing

of the Third and Fourth Types, Position of. T. E. Espin
in Cluster Messier 13, Distribution of. H. K. Palmer
Variable in Cluster Messier 5, Periods of. S. I. Bailey
Variable, Visual and Photographic Light Curves of. S. I. Bailey
Variable, of Algol Type, Densities of. Henry Norris Russell

202

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Double, Density of. Alexander Roberts

STELLAR Parallax, Suggestions for Determination of. Frank Schles

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Stars in the Cluster Messier 5, Periods of. S. I. Bailey

Stars, Visual and Photographic Light Curves of. S. I. Bailey
Stars of Algol Type, Densities of. Henry Norris Russell
Velocity of a Ursae Minoris. W. W. Campbell

Velocity of Polaris. Edwin B. Frost

Velocities of e Librae, h Draconis, λ Andromedae, e Ursae Minoris,

and Draconis. W. W. Campbell

PAGE

272

308

242

333

223

T. E. Espin
Edwin B. Frost

169

207

178

180

343

126

169

255

261

315

180

184

178

Velocities of ẞ Capricorni and v Sagittarii.

W. W. Campbell

W. W. Campbell

241

VELOCITY, Variable, of a Ursae Minoris.

Variable, of Polaris. Edwin B. Frost
VELOCITIES, Variable, of e Librae, h Draconis, λ Andromedae, e Ursae
Minoris, and w Draconis. W. W. Campbell

Variable, of ẞ Capricorni and v Sagittarii. W. W. Campbell
VISITORS to United States Naval Observatory, Recommendations of.
VISUAL and Photographic Light Curves of Variable Stars. S. I. Bailey
WAVE-LENGTH, Corrections to Determinations of Absolute. Edwin
B. Frost
of the Coronal Line.

W. W. Campbell
C. A. Young

WAVE-LENGTHS of Hydrogen Lines, Effect of Pressure upon. J.
Wilsing

YALE Observatory, Photographic Observations of the 1898 Leonids.
W. L. Elkin -

YERKES Observatory Bulletin No. 12. George. E. Hale

For titles of Reviews see Table of Contents.

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178

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241

292

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