Communications to the National Academy of Sciences

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Contents

NO PACE
11
Critique of the Hypothesis of Anomalous Dispersion in Certain Solar
11
An Attempt to Measure the Free Electricity in the Suns Atmosphere
15
Results of an Investigation of the Flash Spectrum without an Eclipse
19
Variability of Spectrum Lines in the Iron Arc C E St John and H D Babcock
25
Investigations in Stellar Spectroscopy IV Spectroscopic Evidence for
26
Photographic Determination of Stellar Parallaxes with the 60inch
31
Absolute Scales of Photographic and Photovisual Magnitude
39
Investigations in Stellar Spectroscopy III Application of a Spectroscopic
124
Discovery of Eight Variable Stellar Spectra Harlow Shapley
137
Preliminary Evidence of Internal Motion in the Spiral Nebula Messier
143
On the Suggested Mutual Repulsion of Fraunhofer Lines
149
Adams Walter S Investigations in Stel King Arthur S An Attempt to Detect
153
The Rotation and Radial Velocity of the Spiral Nebula N G C 4594
157
A Simple Method for Determining the Colors of the Stars
163
Studies of Magnitudes in Star Clusters III The Colors of the Brighter
169

Unsymmetrical Lines in TubeArc and Spark Spectra as an Evujence of
47
Some Vortex Experiments Bearing on the Nature of SunSpots and Flocculi
55
Nova Geminorum No 2 as a WolfRayet Star
61
The Light Curve of XX Cygni as a Contribution to the Study of CePheid
69
A Notation for Use in the Discussion of Star Colors Frederick H Seares
77
Studies of Magnitudes in Star Clusters I On the Absorption of Light
85
The Minute Structure of the Solar Atmosphere
93
A Short Period Cephedj with Variable Spectrum Harlow Shapley
101
Investigations in Stellar Spectroscopy I A Quantitative Method
113
Preliminary Results on the Color of Nebulae Frederick H Seares
177
Studies of the Magnitudes in Star Cluster IV On the Color of Stars
183
The Color of the Standard Polar Stars Determined by the Method
189
The Parallax of the Planetary Nebula N G C 7662 Adriaan van Maanen
199
Photographic Magnitudes of Stars in the Selected Areas of Kapteyn
207
Studies of Magnitudes in Star Clusters V Further Evidence of
217
A Search for an Einstein RelativityGravitational Effect in the
225
The Development of a Source for Standard WaveLengths and the Impor
235
The Location of the Suns Magnetic Axis
245

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