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SCIENCE. 



[N. S. Vol. XXIII. No. 586. 



PAPERS PRESENTED. 

 David Todd : ' Saturn as seen with the Eight- 



een-inch Clark Refractor of the Amherst College 



Observatory.' 



S. I. Bailey: ' Some Variable Star Problems.' 

 Annie J. Cannon : ' Maxima and Minima of 



Variable Stars of Long Period.' 



E. C. Pickering : ' A Systematic Study of Faint 

 Stars.' 



Gr. C. CoMSTOCK: 'Distribution of the Stars.' 



F. H. Seabes : ' Photometric Investigations.' 

 Mbs. W. p. Fleming : ' Some Peculiar Spectra.' 

 E. B. Feost : ' Burnham's Forthcoming' General 



Catalogue of Double Stars.' 



C. L. Poor: 'The Figure of the Sun.' 

 J. A. Paekhurst and F. C. Jordan: 'Photo- 

 graphic Photometry of Rapidly Changing Variable 

 Stars.' 



S. A. Mitchell: 'Spectrograms taken at 

 Daroca, Spain, August 30, 1905.' 



E. B. Frost: 'Observations of Radial Velocities 

 of Stars.' 



G. H. Peters : ' The Solar Corona, as observed 

 by the U. S. Naval Observatory Eclipse Expedi- 

 tion, August 30, 1905, at Porta Coeli, Spain.' 



N. E. Gilbert: 'Polarized Light in the Corona, 

 Eclipse of 1905.' 



C. C. Trowbridge : ' Resemblances between Per- 

 sistent Meteor Trains and the Afterglow from 

 Electrodeless Discharges.' 



B. E. Barnard: 'Vacant Regions of the Sky.' 

 G. C. CoMSTOCK : ' A Proposed Method for the 

 Wholesale Determination of Velocities in the Line 

 of Sight.' (To appear in the Astrophysical 

 Journal. ) 



E. C. Pickering : ' Determination of Absolute 

 Positions of Stars by Photography.' 



D. P. ToDD and R. H. Baker : ' Local Predic- 

 tions for the Total Eclipse of 1907 in Turkestan 

 and Mongolia.' 



J. A. Brasheae : ' On Some Evidences of Perma- 

 nent Set in Optical Surfaces.' 



F. H. Seaees: 'The Polaris Vertical Circle 

 Method of Determining Time and Azimuth.' 



Eric Doolittle : ' Determination of Adjust- 

 ment Errors for the Polar Axis of an Equatorial.' 

 Eric Doolittle : ' The Hough Double Stars.' 

 David Todd: 'On the Practical Requisites for 

 Securing Perfect Definition in Eclipse Photog- 

 raphy.' 



E. B. Frost: 'The Observations of Sun-spots 

 by the late C. H. F. Peters.' 



D. P. Todd and R. H. Baker : ' Computed Tracks 

 and Totality-durations of Total Solar Eclipses in 

 the Twentieth Century.' 



A. O. Leuschner : ' An Analytical Method of 

 Determining the Orbits of New Satellites.' 



W. H. Pickering : ' Planetary Inversion.' 



C. G. Abbot : ' A Standard Pyrheliometer and 



its Use on Mt. Wilson, California.' (Abstract in 



Science, XXIII., p. 203.) 



B. L. Newkirk : ' Tables for the Reduction of 

 Photographic Measures.' 



R. T. Crawford : ' A Contribution on Astro- 

 nomical Refractions.' 



Sarah F. Whiting : ' A Solar Planisphere.' 



B. L. Newkibk : ' Investigation of the Repsold 

 Measuring Apparatus of the Students' Observa- 

 tory, Berkeley, Cal.' 



W. W. Dinwiddie ; ' The 40-foot Camera of the 

 U. S. Naval Observatory Eclipse Station at 

 Guelma, Africa.' 



C. D. Perrine : ' Polarized Coronal Light, Au- 

 gust 30, 1905.' 



F. ScHLESiNGEE and G. B. Blair : ' Anomalous 

 Refraction.' 



Heneietta S. Leavitt : ' New Variable Stars in 

 the Small Magellanic Cloud.' 



R. S. DuGAN : ' Magnitudes and Mean Positions 

 of 359 Pleiades Stars.' 



David Todd : ' Results of Amherst Eclipse Ex- 

 pedition to Tripoli, 1905.' 



M. B. Snyder : ' The Philadelphia Observatory 

 and the Disastrous Fire of March 9, 1905.' 



R. T. Crawford and A. J. Champeeux : ' Orbit 

 of the Seventh Satellite of Jupiter.' 



Saturn as seen with the Eighteen-inch 

 Clark Refractor of Amherst College- 

 Observatory: David Todd. 

 This new telescope, which has especially 

 fine definition and a very dark field, was 

 used the past autumn on the Saturnian sys- 

 tem. Pending completion of the microm- 

 eter, to be employed on the satellites, at- 

 tention was given particularly to the rings, 

 and ball. Differences of illumination in 

 the detail of different zones of the rings 

 were carefully observed and embodied in a 

 drawing. The shadings of the belts on the 

 ball were also set down in estimated posi- 

 tions, and a watch was kept for spots by 

 which to determine anew the rotation time. 



Totality-predictions for the Solar Eclipse 

 of 1907, January 13-14, in Turkestan 

 and Mongolia: David Todd and Robert 

 H. Baker. 



