194 



SCIENCE 



[N. S. Vol. LIII. No. 1365 



Observations of the present disappearance of the 

 rings of Saturn: E. E. Baenakd. 



Probable explanation of the apparent elongation of 

 the Gegenschein: E. E. Babnakd. 



Comments on the spectra of Nova Cygm No. 3 and 

 Nova Aquilae No. 3: S. B. Barrett and E. B. 

 Ehost. 



The system of magnetic forces during the solar 

 eclipse of May S9, 1919: Louis A. Batjer. 



The light-curve of Nova Cygni No. S: Lbon Camp- 

 bell. 



Some new methods for double star orbits: G. C. 



COMSTOCK. 



An instrumental source of doubling of the emission 

 lines in the spectrum, of y Cassiopeiae: E. H. 



CUKTISS. 



The search for the gravitational effect predicted 

 by Einstein for solar wave-lengths: Ealph E. 



, Deluet. 



Second note on the displacements of spectrum lines 

 at the limb of the sun: Ralph E. Delifrt. 



Further note on fluctuations in the moon's longi- 

 tude in relation to meteorological variations: 



, Ealph E. Deluet. 



Some measurements of the displacements of spec- 

 trum lines in the penumbrae of sun-spots: 



, Ealph E. Deluey and John L. O'Connoe. 



Notes on atmospheric conditions at Tucson, Ari- 

 zona: A. E. Douglass. 



Stellar parallaxes determined at the Dearborn Ob- 

 servatory : Philo" Eox. 



On some " irrecondlables" among stellar radial 

 velocities: E. B. Erost. 



Sundry spectroscopic binaries: E. B. Eeost and S. 



, B. Barrett. 



Notes on Nova Cygni No. S : W. E. Harpee. 



The spectroscopic orbit of Boss 5070: W. E. 

 Harper. 



The photographic light-curve of Nova Cygni No. 



. S:'F. Heneoteau. 



The North America nebula: P. Heneoteau. 



decent photographic observations of several well- 

 Tcnown novae: C. O. Lampland. 



Motions of the prominence of October 8, 19S0: O. 

 J. Lee. 



Progress in the reduction of the Kapteyn zone at 

 north declination 45° : O. J. Lee. 



The Des Moines municipal observatory: D. W. 

 Moeehousb. , 



On the age of the stars: E. E. Moulton. 



Orbit of the spectroscopic binary t Cygni {period 

 3 h. S5 m.) : J. Paraskevopoulos. 



Objective prism spectra of Nova Aquilae No. S 



. and Nova Cygni No. 3: J. A. Parkhuest and 

 E. B. Frost. 



The diameter of a Orients by Michelson's inter- 

 ferometer methods : E. G. Pease. 



The intensity distribution in tpyical stellar spec- 

 tra: H. H. Plaskett. 



The spectroscopic orbit and dimensions of Z. Vul- 

 peculce: J. S. Plaskett. 



A wide-angle astronomical doublet: Frank E. 

 Eoss. 



The KostinsTcy effect : Frank E. Eoss. 



Comparative tests of the 100-inch and 60-inch re- 

 flectors: F. H. Seaees. 



Secular motion of perihelion due to the dragging 

 of a compressible aether: L. SttBERSTEiN. 



On some new variable stars: Joel Stebbins. 



Spectrographic observation of rotating spiral 

 nebul(B: V. M. Sliphee. 



Photographic distortion on eclipse plates and the 



. Einstein effect: Feedeeick Slocum. 



Chronographic measurement of small time inter- 



. vols: E. Meldeum Stewart. 



Recording of wireless time signals: E. Meldrum 

 Stewart and J. P. Henderson. 



Circle flexure of the Ottawa meridian circle: E. 



, Meldrum Stewaet and C. 0. Smith. 



Progress of the measurement of the Hussey double 

 stars: G. Van Biesbeoeck. 



Note on the effect of the barometric gradient on 

 meridian observations : C. C. Wtlie. 



On the probable reason why certain periodic comets 

 have not been found on their predicted returns: 

 Jessica M. Young. 



The spectroscopic orbit of Draconis: E. K. 



. Young. 



Joel Stebbins, 



Secretary 



SCIENCE 



A Weekly Journal devoted to the Advancement of 

 Science, publishing the official notices and pro- 

 ceedings of the American Associatioc for 

 the Advancement of Science 



Published every Friday by 



THE SCIENCE PRESS 



LANCASTER, PA. GARRISON, N. Y. 



NEW YORK, N. Y. 



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