198 SCIENCE PROGRESS 



corne, Astroph. Journ. 147, 134, 191 8. The Orbit of the Spec- 

 troscopic Binary, and Phoenicis, ibid. 196. 



Photographic Observations of 6 Circumpolar Variables, 

 H.A., 84, No. 3. 



Turner, H. H., Concluding note to Long Period Variables, 

 M.N., R.A.S.,1%, 538, 1918. This is the concluding note to 

 the discussion by H. H. Turner and Mary A. Blagg of Baxen- 

 dell's observations of variable stars, the 10 instalments of 

 which have appeared in the last few volumes of the Monthly 

 Notices. 



Stellar Distribution and Motions. — Graham, T. S. H., The 

 measurement of radial velocities of stars by means of the 

 objective prism spectrograph, Journ., R.A.S.C. 12, 129, 1918. 



Lunt, J., Radial Velocities of 60 Stars, Astroph. Journ. 47, 

 201, 1918. 



Seares, F. H., The Brightness of the Stars, their Distribu- 

 tion, Colours and Motions, Pub. Ast. Soc. Pac. 30, 99, 191 8. 

 This is a good summary of recent work. 



The Distance of the Great Nebula in Orion, Harv. Circ. No. 

 205. 



The Distances of the Pleiades and of Coma Berenices, Harv. 

 Circ. No. 206. 



Wirtz, C, Uber die Bewegungen der Nebelflecke, Ast. 

 Nach. No. 4933, 191 8. 



Kapteyn, J. C, On the Parallaxes and Motions of the 

 Brighter Galactic Helium Stars between Galactic Longitudes 

 150 and 2 1 6°, Astroph. Journ. 47, pp. 104, 146, 255, 191 8. 



Perrine, C. D., On the Cause of the Distance-velocity 

 Equation in Stellar Motions, Astroph. Journ. 47, 179, 191 8. 



Adams, W. S., and Stromberg, G., Radial Velocity and 

 Absolute Magnitude. Comments on Prof. Perrine 's article, 

 Astroph. Journ. 47, 189, 191 8. 



Furuhjelm, R., Recherches sur les mouvements propres 

 des etoiles dans la zone photographique de Helsingfors, I., 

 9 h -i2 h , Acta Soc. Scient. Fennicce, 48, No. 1. The first 

 portion of a determination of all the appreciable proper motions 

 in the Helsingfors astrographic zones. 



Glaucy, A. Estelle, The Absolute Parallax of Polaris, 

 Astron. Journ. 31, No. 729, 191 8. 



Stellar Photometry, etc. — Comparison of Colour Index and 

 Class of Spectrum, H.A. 80, No. 9. 



