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Mercury and Regulus, Trails of..

Meteor durimeter, Lincoln La Paz.
Mira, diagram of position of......

182

375

72

Moon, A new projection of the, Russell W. Porter, Plate XXXVIII.....Op. 573
Moonscapes by Russell W. Porter, Approach to Gassendi, Plate XXXI...Op. 514
Looking north out of Gassendi,

Plate XXXIII. Op. 516
Region around Rost, Plate XXXIV.Op. 517
The floor of Gassendi, Plate XXXII. .Op. 515

Nebula, The Spiral, M 64, Comae Berenices, Plate XXXIX.....
Nebulae, Types of spiral and disc, Plate XVI..
North Pole among the stars, Motion of the, O. H. Truman..
Observatory of La Plata, General view of the, Plate V..........

R. W. Porter, Views of.....

...Op. 615

.Op. 305

631

.Op. 141

.311, 312, 313, 317

The Dearborn, of Northwestern University, Plate XXVIII..Op. 475

Dominion, Ottawa, Canada.......

Sproul, Swarthmore, Pa., Plate XXXVI..
Van Vleck, Middletown, Conn., Plate XXIII.
Plan of the main floor of the....
Tablet in the main corridor of the..
The eighteen and a half inch telescope
Plate XXIV ..

Planets, Apparent paths of the, among the stars.

Polar reflecting telescope (diagrams)...

Pyramids around Gizeh (diagram).

Reflector dome and comet-seeker of the La Plata Observatory.
Rosa Ursini, dedication to Paulus Jordanus II, Plate XVIII..
Full page illustration at commencement of Book III,
Plate XX

Reduced fac-simile title page of, Plate XIX..

RX Herculis, Observed magnitudes and theoretical light curve of.

The system of, compared with the sun..

Small star with large proper motion, Photographs of region about the,
E. E. Barnard, Plate XXIX...

338

.Op. 578
..Op. 407

409

415

of the,

...Op. 410

.49, 50

309, 310, 316

626

14

.Op. 344

.Op. 347

.Op. 345

693

693

....Op. 505

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Saturn-Opposition 1914-15, Drawing by Dr. Percival Lowell,

Plate XXV

Op. 419

Solar prominence of January 7, 1916, The, Photographed by O. J. Lee,

Plate VIII

..Op. 205

Sun and spots, Drawings of, accompanying the Tres Epistolae, Plate IX. .Op. 212
comparative size of, and the earth...........

16

showing spots and faculae, reduced from Rosa Ursini, Plate XXII..Op. 349
Sun-spot observations, Fac-simile of Harriot's first, Plate VI..

Op. 150

Sun spots, March 9, 1916......

265

Tres Epistolae, Reduced fac-simile title page of, Plate X....

Theodolite for testing telescopic specula (diagram)..

Transit Factors, diagram for computation of....
Telescopes, Mr. Welch and his...

Uranus, Apparent orbits of satellites of....

..Op. 213

371

.18, 20

540

53

Variable star observers, The American association of, Plate IV.........Op. 124
Variable stars, Light curves of, C. B. Lindsley 64, 122, 123, 191, 192, 257,
..258, 326, 452, 453, 523, 524, 597, 598, 678

Venus and Jupiter, Trails of....

263

at conjunction

467

drawings of, in 1915, David H. Wilson, Plate XXXVII..

.Op. 571

William Frederick King, Plate XVII.....

.Op. 337

World at the time of Louis XIV, The system of the..

544

GENERAL INDEX TO VOLUME XXIV

Adams, Walter S., An interesting case of two stars of common motion...............
Recent stellar spectroscopic results (abstract).....

Two spectroscopic binaries...

Alden, Harold L., On the calibration of the photometer wedge of the Le-

ander McCormick Observatory (abstract).....

266

585

266

586

Apple, A. Thos. G., Observations of Jupiter-Apparition of 1914.
Arcturus-Rising, Charles Nevers Holmes..
Aristillus, Markings on, E. C. Slipher.....

test for planetary definition, The, William H. Pickering.
the quality of seeing, The, William H. Pickering.
Asteroid elements, The interrelation of the, Samuel G. Barton..
(719) MT, Albert, Ephemeris of.....

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174

248

77

273

574

587

680

613

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Barton, Samuel G., The interrelation of the asteroid elements (abstract).... 587
Bauer, L. A., Note on rotation periods of planets (abstract).....

587

Bell, Louis, Stellar magnitudes and light ratios.....
Bigelow, Edward F., The greatest need of astronomy.
Binaries, Two spectroscopic, Walter S. Adams.
Binary RX Herculis, The eclipsing......

Blatchley, Henry G., Trails of Venus and Jupiter.
Boss' Catalogue, New edition of......

Brashear, Dr. John A., A testimonial dinner to...
Brashear, John A., The Allegheny Observatory.

356

• 333

266

692

262

73

132

404

Brown, Ernest W., On the progress of the new lunar tables (abstract)..... 588
Burnham's General Catalogue of Double Stars, An extension of, Eric Doo-
little

633

Burns, Keivin, Determination of wave lengths by interference (abstract).... 588
Calibration of the photometer wedge of the Leander McCormick Observa-
tory, Harold L. Alden.................

Campbell, Frederick, Popular astronomical errors.

Using the American ephemeris...

586
268

80

Campbell, Leon, Co-operation in variable star observing (abstract)....... 589
Campbell, W. W., Spectrographic observations of relative motions within the
planetary nebulae (abstract)............................

... 655

The spectral type and radial velocity of Barnard's proper
motion star (abstract).......

Cannon, Annie J., Peculiar spectra found in preparing the new Draper Cat-
alogue, (abstract)

Canopus, The giant sun, Charles Nevers Holmes..

Cassell, William Haller, An unusual meteor...

.... 656

656

14

331

Comet 1915 e (Taylor).

129

Transits of Mercury and Venus...

171

Celestial motions in the line of sight, Russell Sullivan..........

109, 162

Chabot Observatory dome as wireless aerial, The......

267

Chant, C. A., W. F. King, Late chief astronomer for Canada..

337

Chronology of the Egyptian Pyramids, F. J. B. Cordeiro....

624

Colbert, Elias, Address at the semi-centennial of the Dearborn Observatory.. 476

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Cook, John A., The ruined lunar crater walls.

Copernicus, Nicolaus, Charles Nevers Holmes..

Cordeiro, F. J. B., Chronology of the Egyptian Pyramids..

Cosmological ideas among the Greeks, The, Hector Macpherson...
Crump, Clifford C., Planet notes...

The spectroscopic binary y Lyrae (abstract).
Curtis, Heber D., Forms of planetary nebulae (abstract).....
Curtiss, R. H., On the widths of hydrogen emission lines in Class B spectra
(abstract)

318

218

624

358

.249, 320, 388

658

658

658

Some structure variations in hydrogen emission lines in
spectra of Class B (abstract)....

659

Damping of waves and other disturbances in Mercury..
Dark Nebulae, Russell Sullivan..

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390

Daylight saving

Dawson, Bernard H., The frequency of striking conjunctions of Venus and
Jupiter

Dearborn Observatory parallax program, First results on the, Philip Fox.... 663
The semi-centennial of the, Philip Fox......
475

De Lury, Ralph E., Note on a supposed variation in the solar rotation (ab-
.stract)

662

The effect of haze spectrum on spectroscopic determina-
tions of the solar rotation (abstract)....

660

Discovery of the solar spots, The history of the, Walter M. Mitchell,

...22, 82, 149, 206, 290, 341, 428, 488, 562
Distribution of gaseous matter throughout interstellar or cosmic space, The,
Theodore William Schaefer......

Doolittle, Eric, An extension of Burnham's General Catalogue of Double
Stars (abstract)

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Double Stars, An extension of Burnham's General Catalogue of, Eric Doo-
little

663

Fox's measures of, Eric Doolittle....

500

Draper Catalogue, Peculiar spectra found in preparing the new, Annie J.
Cannon

656

Durimeter for meteor observations, A, Lincoln La Paz.
Earth, The shape of the......

374

200

Eclipses of 1916, The William F. Rigge.

Eclipsing binary RX Herculis, The.....

Eros for 1917, Elements and ephemeris of, F. E. Seagrave..

Erosion on the moon, Evidences of, William H. Pickering.
Ephemeris, Using the American, Frederic Campbell.............
Exner, Franz M., A striking aurora...

Fairfield, Priscilla, Observations of sun spots at Boston University.

Falsifying the time for the sake of economy..

Fox, Philip, First results on the Dearborn Observatory parallax program
(abstract) ....

The semi-centennial of the Dearborn Observatory.

Fox's measures of double stars, Eric Doolittle......

Francis, Vincent, The problems of the nebulae...

Fry, Thornton C., The graphical computation of transit factors...

I

692

198

441

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