508 



SCIENCE 



[N. S. Vol. L. No. 1300 



Secretary — Joel Stebbins. 



Treasurer — Benjamin Boss. 



Councilors — Ernest W. Brown, Otto Klotz, Solon 

 I. Bailey, W. J. Hussey, Henry Norris Russell, V. 

 M. Slipher. 



The program of papers was as follows: 

 Variations of type in the Cepheid variables I Carinae 



and T] Aquilce as shown by the general spectrum: 



Sebastian Albrecht. 

 A systematic search for novm at the Harvard Ob- 

 servatory: S. I. Bailey. 

 On the cliange in the period of the variable star 



Bailey No. 33 in the cluster M5 : E. E. Baknabd. 

 Semeasurement of Ball's star in the Pleiades: E. 



E. Barnard. 

 Variable stars in M 11 : E. E. Barnard. 

 On the varnishing of astronomical negatives: E. E. 



Barnard. 

 Some observations of the total solar eclipse on May 



S9, 1919, at Cape Palmas, Liberia: L. A. Bauer. 

 Hypersensitizing commercial panchromatic plates: 



S. M. Bdrka. (Introduced by 0. C. Kiess.) 

 Some recent developments in the study of S8 



Cygni: Leon Campbell. 

 The spectra of variable stars of long period: 



Annie J. Cannon. 

 Atmospheric refraction near the horizon: George 



C. COMSTOCK. 



Studies of class B spectra having hydrogen emis- 

 sion: R. H. CURTISS. 



Fluctuations in the moon's longitude in relation to 

 meteorological variations: Ralph B. DeLurt. 



Apparent relation between Chinese earthquakes 

 and California tree growtlis, 0-1680 A.D.: Ralph 

 E. DeLurt. 



Levels of the Great Lakes in relation to numbers of 

 sun-spots: Ralph E. DeLurt. 



Simultaneous spectroscopic observations of the rate 

 of rotation in north and south solar hemispheres : 

 Ralph E. DeLurt. 



The periodograph and its application to variable 

 star periods and other problems: A. E. Douglass. 



On the eclipsing variables BT Persei and TJ Cephei: 

 R. S. DUGAN. 



Preliminary results of a comparative test of the 

 100-vnch and 60-inch telescopes of the Mount 

 Wilson Observatory : George E. Hale. 



Sates of the standard sidereal clocks at the XT. S. 

 Naval Observatory : J. C. Hammond and C. B. 

 Watts. 



Note on the spectrum of Nova Aquilw No. S: W. 

 E. Harper. 



The orbit of the spectroscopic binary t JJelphini: 

 W. E. Harper. 



The orbit of the spectroscopic binary Boss 4507: 

 W. E. Harper. 



A desideratum in solving Kepler's problem: H. A. 

 Howe. 



The red and infra-red arc spectra of eight ele- 

 ments: C. C. Kiess and W. E. Meggers. 



Color-index of planets: Edward S. King. 



Photographic observations of tlie Great Nebula in 

 Orion: C. O. Lampland. 



Star tables good to the year SOOO for civil engineers 

 and navigators: H. C. Lord. 



Origin of the sun's heat: W. D. MacMillan. 



False spectra produced by gratings: W. F. Meg- 

 gers, C. C. Kiess and F. M. Walters, Jr. 



Evidences of change in coronal structure during the 



eclipse of June 8, 1918: J. A. Miller. 

 The masses of 3S visual binary stars: J. A. Miller 



AND J. H. Pitman. 

 Measures of double stars on photographs: Charles 



P. Olfviee. 

 Shifting absorption at the lieads of the brighter 



helium bands in the spectrum of y Argus: C. D. 



Perrine. 

 Methods of asteroid observation and reduction: 



George Henry Peters. 

 The great eruptive prominences of May S9 and 



July 15, 1919: Edison Pettit. 

 Studies in prominence cliaracteristics : Edison 



Pettit. 

 The proper motions and parallaxes of 359 stars in 



the cluster h Persei: Hannah Steele Pettit. 

 The spectroscopic orbits and dimensions of the 



eclipsing variables U Ophiuchi, RS Vulpeoulce, 



and TW Draconis: J. S. Plaskett. 

 Report on progress of work with the 72-inch tele- 

 scope: J. 8. Plaskett. 

 Annular eclipse of the sun of 1919, November ZB, 



as visible in the United States: Wm. P. Rigge. 

 Direct micrometrical observations of the sun: E. 



D. Roe, Jr. 

 The spectrum of the milky way: V. M. Sliphes. 

 Ail-American time: Elliott Smith. 

 Progress in photo-electric plwtometry : Joel Steb- 



BINS. 



Peirce's criterion: R. M. Stewart. 



The treatment of discordant observations: R. M. 



Stewart. 

 Tests of dyes for red and infra-red photography : 



Florence J. Stockee. 

 Experiments with Kapieyn's method for reducing 



guiding error: E. Trumpler and Frank 



Schlesinger. 

 Meridian drole observations of Nova Aquilce No. 



3: R. H. Tucker. 

 The use of semi-absolute photographic positions in 



double star astronomy: George Van Bies- 



BEOECK. 



Note on proper motions of certain long period 

 variable stars: Anne S. Young and Louise F. 

 Jenkins. 



Three spectroscopic binary orbits: Eetnold K. 

 Young. 



Joel Stebbins, 



SCIENCE 



A Weekly Journal devoted to the Advancement of 

 Science, publishing the official notices and pro- 

 ceedings of the American Association for 

 the Advancement of Science 



Published every Friday by 



THE SCIENCE PRESS 



LANCASTER, PA. GARRISON, N. Y. 



NEW YORK, N. Y. 



Entered in the post-office «t Lanculti. Pa., ai oecood clan mattq 



