460. 



SCIENCE 



[Vol, LVI, No. 1451 



A new spectrooompartttor : Ealph E. DeLury. 



The Steward Observatory of the University of 

 Arizona: A. E. Douglass. 



The variaMe douhle star X Ophiuchi: C. H. 

 Gingrich. 



Parallax of the nebida surrounding 

 S.D.+Sl°ei3: C. H. Gingrich. 



The orbits of the spectroscopic components of 

 Boss 3793 (foil.): W. E. Harper. 



Two long period spectroscopic binaries: W. E. 

 Harper. 



The relation befween the stars of the Beta 

 Canis Majoris type and the Cepheid variables: 

 F. Henroteau. 



Proper motions of stars from micrometric 

 measures: Laura E. Hill. 



A table of x ^ sin x: Herbert A. Howe. 



The variable star' SX Herculis: M. F. Jordan. 



Wave-lengths in the red and infra-red spectra 

 of oxygen and nitrogen: G. C. KiESS. 



Photometry of moon: Edward S. King. 



Color-index apparatus : Edward S. King. 



Photographic observations of nebula;: C. O. 

 Lampland. 



A new scouting spectroscope for prominences: 

 Oliver J. Lee. 



On the determination of magnitude error by 

 Kapteyn's "spot" method: Oliver J. Lee. 



The distribution of novce: Knut Lundmark. 



Historical note concerning the fundamental 

 equations in stellar statistics: Knut Lundmark. 



The proper motions and mean parallax of spiral 

 neiulce: Knut Lundmark. 



The influence of a general cosmic curvature on 

 the JSinstein phenomena in the solar system: 

 A. G. LuNN. 



Internal motion in the spiral nebulce : N. G. C. 

 2403, 4736 and 5055: A. van Maanen. 



The quantum theory of photographic exposure: 

 C. E. K. Mees. 



The graininess of photographic negatives: 

 G. E. K. Mees. 



Some new sensitising dyes : C. E. K. Mees. 



The relation between intensity and exposure: 

 G. E. K. Mees. 



Interferometer measurements of the longer 

 waves in the iron arc spectrum: W. F. Meggers 

 and G. C. Kiess. 



Recent advances in nehuUe : D. H. Menzel. 



Interferometer measures of star diameters: 

 A; A. MicHELSON and F. G. Pease. 



Trigonometric parallaxes of Cepheids and early 

 type stars determined by photography at the 

 Leander MoCormick Observatory : S. A. Mitchell. 



On the daily variation in cloclc corrections: 

 H. E. Morgan. 



Photometric results in certain Kapteyn areas: 

 J. A. Parkhurst. " 



The total radiation of variable stars observed 

 with the vacuum thermocouple at Mt. Wilson: 

 Edison Pettit and Seth B. Nicholson. 



A pendulum method of recording radio time 

 signals: Edward C. Phillips. 



The ultra-violet spectrograph of the 7S-inch 

 telescope: J. S. Plaskett. 



Tlie spectra of three 0-type stars: H. H. 

 Plaskett. 



Some fine occultations coming: William F. 

 Eigge. 



Planetary photography : Frank E. Eoss. 

 Accuracy 'of photographic registration: Frank 

 E. Eoss. 



Notes on ionization and- pressure in the stars: 

 Henry Norris Eussell. 



Further observations on wave-lengths in the 

 spectrum' of Venus: Charles B. St. John and 

 Seth B. Nicholson. 



The problem of three bodies and the spectrum 

 of neutral helium: Ludwik Silberstein. 



A possible new method of stellar photometry : 

 Ludwik Silberstein. 



Observation of temporary ivhite areas on Mars: 

 E. C. Slipher. 



The star fields for the 1923 and 1935 total 

 eclipses of the sun: Frederick Slocum. 

 On ionization in stars: John Q. Stewart. 

 On the spectroscopic binary Gamma Ursce 

 Minoris: Otto Struve. 



Chronographia recording of wireless time sig- 

 nals: E. Meldrum Stewart and J. P. Hen- 

 derson. 



Comparison between Paris and Washington 

 time services based on chronographic registration 

 of Bordeaux, Annapolis, and Arlington radio 

 time sigiials: F. D. XJrie. 



Observations of Jupiter's faint satellites, and 

 of Phoebe, with the two- foot reflector of the 

 YerTces Observatory : G. Van Biesbroeck. 



Sadial velocity of the Prmsepe cluster from ob- 

 jective-prism neodymium plates: H. G. "Wilson. 

 Eclipsing variables showing two spectra: G. C. 

 Wylie. 



Proper motions of some faint stars: Everett I. 

 Yowell. 



Uniform clocTt rates for a period of an entire 

 year: M. L. Zimmer. 



Joel Stebbins, 



Secretary 



