RECENT ADVANCES IN SCIENCE 555 



Sum of a Number of Tabular Quantities, Ast. Journ. 30, 



No. 21, 1917. 



The Solar System. — Lau, H. E., Saturn und sein Ring, 

 Ast. Nach. No. 4906. 



Wilkens, A., Methoden zur Ermittelung der speziellen und 

 der absoluten Koordinatenstorungen der Planeten der Jupiter- 

 gruppe durch Jupiter, Ast. Nach. No. 4906. 



Chevalier, S., Diametre et Forme du Disque Lunaire, 

 Bull. Ast. 34, 161, 1917. 



Spectroscopy. — Fowler, A., and Strutt, Hon. R. J., 

 Absorption Bands of Atmospheric Ozone in the Spectra of 

 Sun and Stars, Proc. R.S. (a) 93, 577, 191 7. 



St. John, C. E., and Babcock, H. D., Elimination of the 

 Pole Effect from the Source for Secondary Standards of Wave- 

 Length, Astroph. Journ. 46, 138, 191 7. 



Lundmark, K., and Lindblad, B., Photographisch effektive 

 Wellenlangen fur einige Spiralnebel und Sternhaufen, Ast. 

 Nach. No. 4907, 1907. 



St. John, C. E., A Search for an Einstein Relativity Gravi- 

 tational effect in the Sun, Proc. Nat. Acad. Set. 3, 450, 191 7. 



Variable and Binary Stars. — Guthnick, P., Ubersicht iiber 

 die Ergebnisse lichtelektrischen Messungen 1914-17, Ast. Nach. 

 No. 4903-4. 



Harper, W. E., The Orbits of three Spectroscopic Binaries : 

 20 it Cassiop. ; 25 Canis Maj.; Boss 35 1 1 , Journ. R.A.S.C., 

 11, 341, 1917. 



Luizet, M., Sur l'Etoile 7 Lion, Bull. Ast. 34, 169, 191 7. 

 Sur l'Etoile 7 Cochu, Bull. Ast. 34, 172, 191 7. 



Stellar Distribution, etc. — Perrine, C. D., Preliminary Ex- 

 amination of Planetary Nebulae for Preferential Motion, 

 Astroph. Journ. 46, 175, 191 7. 



Raymond, H., The Principal Axes of Distribution of Stellar 

 Motions, Ast. Journ. 30, 191, 191 7. 



Green, W. K., A Study of Certain Nebulae, Lick Obs. Bull. 

 No. 298. 



Charlier, C. V., Statistical Mechanics based on the Law 

 of Newton, Lund Medd., Ser. II. No. 16, 191 7. 



Eine Studie iiber die Analyse der Stcrnbewegungen, Lund 

 Medd. Ser. I. No. 78, Ark. for Mat. Astr. och Phys. 12, No. 10. 



Uber hydrodynamisches Gleichgcwicht in Sternsystemen, 

 Lund Medd. Ser. I. No. 82, Ark. for Mat., etc., 12, No. 21. 

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