THE ASTROPHYSICAL JOURNAL

THE

ASTROPHYSICAL JOURNAL

An International Review of Spectroscopy and
Astronomical Physics

CONTENTS

NUMBER I

THE OPTICAL AND PSYCHOLOGICAL PRINCIPLES INVOLVED IN THE INTER-

PRETATION OF THE SO-CALLED CANALS OF MARS. Simon Newcomb

ARC SPECTRA UNDER HEAVY PRESSURE. W. J. Humphreys

APPARATUS FOR OBTAINING ELECTRIC ARCS UNDER HEAVY PRESSURE.

W. J. Humphreys .

.

MODIFICATION IN THE APPEARANCE AND POSITION OF AN ABSORPTION

BAND RESULTING FROM THE PRESENCE OF A FOREIGN GAS. R. W.

Wood

THE ABSENCE OF VERY LONG WAVES FROM THE SUN'S SPECTRUM. E. F.

Nichols

EXPERIMENTAL TEST OF DOPPLER'S PRINCIPLE FOR LIGHT-RAYS. Prince

B. Galitzin and J. Wilip

MINOR CONTRIBUTIONS AND NOTES: A Photographic Study of the Spec-

trum of Saturn, V. M. Slipher, 59; Photographs of the Doppler Effect in

the Spectrum of Hydrogen and of Mercury. Rejoinder to Mr. Hull's

Reply, J. Stark, 63; Are Luminous Metallic Particles Thrown out from

the Poles in the Spark Discharge? G. F. Hull, 66; Venus as a Luminous

Ring, Henry Norris Russell and Zaccheus Daniel, 69.

NUMBER II

ABSORPTION AND EMISSION SPECTRA OF NEODYMIUM AND ERBIUM COM-

POUNDS. John Augustus Anderson

PHYSICAL NATURE OF METEOR TRAINS. C. C. Trowbridge

ON THE DOPPLER EFFECT IN THE SPECTRUM OF HYDROGEN AND OF MER-

CURY. G. F. Hull

.

117

120

NOTE ON DISPLACEMENT OF SPECTRAL LINES. J. Larmor

THE VARIABILITY IN LIGHT OF Mira Ceti AND THE TEMPERATURE OF

SUN-SPOTS. A. L. Cortie

.

MINOR CONTRIBUTIONS AND NOTES: Portrait of Sir William Huggins, 128;

Band Spectrum of Vanadium, H. Konen, 129; Hermann Carl Vogel-

Obituary Notice, 130.

NUMBER III

THE CANALS OF MARS, OPTICALLY AND PSYCHOLOGICALLY CONSIDERED

-A REPLY TO PROFESSOR NEWCOMB. Percival Lowell

NOTE ON THE PRECEDING PAPER. Simon Newcomb .

123

131

141