RECENT ADVANCES IN SCIENCE 



183 



Slits I inch in length and \ inch wide, placed 47 inches from 

 the focus, were used. The cone of light in that position had 

 a section of 2-9 inches. The focal length of the telescope is 

 1,600 inches. The fringes were found to disappear for a 

 certain separation and position angle of the slits, showing that 

 the two components are of approximately equal brightness. 

 The following values of distance and position angle were 

 obtained : 



showing rapid orbital motion, in agreement with spectro- 

 scopic evidence. 



The following is a selection of recent papers of importance : 



GuiLLAUME, E., Les Bases de la Theorie de la Relativite, Rev. GSn. des 

 Sciences, 31, 200, 1920. ■ 



Rankine, a. D., andSiLBERSTEiN, L., The Propagation of Light in a Gravi- 

 tational Field, Phil. Mag., Sixth Ser., 39, 586, 1920. 



Majorana, Q., On Gravitation : Theoretical and Experimental Researches, 

 Phil. Mag., Sixth Ser., 39, 488, 1920. 



Dyson, Sir F. W., Eddington, A. S., and Davidson, C, A Determination 

 of the Deflection of Light by the Sun's Gravitational Field from Obser- 

 vations made at the Total Eclipse of May 29, 1919, Trans. R.S., 220A, 

 291, 1920. 



Crommelin, a. C. D., Comets with Small Perihelion Distance and the Re- 

 sisting Medium, M.N., R.A.S., 80, 475, 1920. 



Evershed, J., Displacement of the Lines in the Solar Spectrum and Ein- 

 stein's Prediction, Observatory, 43, 153, 1920. 



St. John, C. E., Displacement of Solar Lines and the Einstein Effect, Obser- 

 vatory, 43, 158, 1920. 



Vegard, L., and Krogness, O., The Position in Space of the Aurora Polaris, 



from Observations made at the Halode Observatory, 1913-14, Geofysike 



Pub., 1, No. I, utgit uv den Geofys .-Kommission (Kristiania : A. W. 



Brogger, 1920. Pp. ix + 172). 

 Jeffries, H., On Turbulence in the Ocean, Phil. Mag., Sixth Ser. 39, 578, 



1920. 

 Przybyllok, E., Die Nutationskonstante abgeleitet aus den Beobachtungen 



des Internationalen Breitendienstes, Zentralbureau der Infernationalen 



Erdmessung, Neue folge der Veroff., No. 36, 1920. 

 Sanders, C, and Jones, H. S., Latitude Variation Observations at Matuba, 



Cabinda (Portuguese Congo), M.N., R.A.S., 80, 455, 1920. 

 Hills, E. H., On the Suspended Zenith Telescope of Durham Observatory, 



Part I, M.N., R.A.S., 80, 564, 1920. 



KusTNER, F., Der Kugelformige Stemhaufen, Messier 6, Veroff. der Univ. 



Sternwarte zu Bonn., No. 14, 1920. 

 LuDENDORFF, H., Weitere Untersuchungen iiber die Massen der spektro- 



skopischen Doppelsterne, Ast. Nach., 211, No. 5046. 

 Stebbins, J., The Eclipsing Variable Star, X Tauri, Astroph. Journ., 51, 193. 



1920. The Ellipsoidal Variable Star, n^ Orionis, ibid., p. 218. 



