RECENT ADVANCES IN SCIENCE 19 



Henroteau, F., A Spectrographs Study of k Pegasi, Lick 

 Obs. Bull., No. 304, 191 8. k Pegasi is a visual binary of 

 short period (11-37 years), and magnitudes 4 m -8, 5 m -3. One 

 of the components is a spectroscopic binary. The elements 

 of both systems are deduced. 



Comstock, G. C, The Orbit of £2026 = -87561, Ast. Journ. 

 31, No. 5, 1917. 



Chant, C. A., The Variable Star W Virginis, Journ. 

 R.A.S.C, 12, 47, 191 8. 



Shapley, H., and v. der Bilt, J., Notes on the Colour-curve 

 and Light Elements of W Ursse Majoris, Astroph. Journ. 46, 

 281, 1917. 



Martin, C, and Plummer, H. C, The short-period Variable 

 RZ Cephei, M.N., R.A.S., 78, 156, 191 7. 



Pickering, E. C, 21 new Variable Stars, Harv. Coll. Circ. 

 No. 201 ; Maxima in 191 8 of Variable Stars of Long Period, 

 ditto, No. 202. With long-period variables the light changes 

 are not regular. This yearly list contains maxima computed 

 from recent maxima. 



Stellar Distribution, etc. — Jeans, J. H., The Equations of 

 Radiative Transfer of Energy, M.N., R.A.S., 78, 28, 191 7; 

 The Evolution and Radiation of Gaseous Stars, M.N., R.A.S., 

 78, 36, 191 7. 



Eddington, A. S., The Radiative Equilibrium of the Stars. 

 Reply to Mr. Jeans' Criticisms, M.N., R.A.S., 78, 113, 1918. 



Stromberg, G., A determination of the Solar Motion and 

 the Stream Motion from Radial Velocities and Absolute 

 Magnitudes of Stars of late Spectral Types, Astroph. Journ. 

 48, 7, 1918. 



Perrine, C. D., Relation to Proper Motion of Preferential 

 Motion and of the progression of Spectral Class and Magnitude 

 Velocity, Astroph. Journ. 46, 266, 191 7. 



Halm, J., On the Relation between Star Counts and 

 Apparent Magnitude, M.N., R.A.S., 78, 312, 191 8. 



Crommelin, A. C. D., Are the Spiral Nebulae External 

 Galaxies? Scientia, May 191 7, and Journ., R.A.S.C, 12, 33, 

 1918. 



Eddington, A. S., Researches on Globular Clusters, 

 Observatory, 40, 394, 191 7; The Dynamical Problems of the 

 Stellar System, Observatory, 41, 132, 191 8. 



