3 6o SCIENCE PROGRESS 



Epstein, Th., Rotationselemente der Sonne, Ast. Nach. 



4959, 1918. 



Bauer, L. A., Relation between the Secular Variation of 



the Earth's Magnetism and Solar Activity, Terrestrial Magnet- 

 ism, 23, 1 and 61, 191 8. 



Chapman, S., The Influence of Changes in Lunar Distance 

 upon the Lunar-diurnal Magnetic Variation, Terrestrial Magnet- 

 ism, 23, 25, 191 8. 



Moritz, R., On the Literal Development of the Motion of 

 the Lunar Perigee, M.N., R.A.S. 78, 615, 191 8. 



Puiseux, P., and Jekhowsky, B., Sur les inegalites sys- 

 tematiques du contour apparent de la Lune, Bull. Astr. 35, 

 161, 1918. 



Audoyer, H., Formules et tables nouvelles relatives a 

 l'etude du mouvement des cometes et a differents problemes 

 de la th£orie des orbites, Bull. Astr. 35, 5, 191 8. 



Phillips, T. E. R., The Motion in Longitude of the Red 

 Spot on Jupiter, M.N., R.A.S. 78, 630, 191 8. 



Anhangen, W., On the Apparent Apsides of a Satellite as 

 published in the American Ephemeris and Nautical Almanac, 

 Astron. Journ. 31, No. 740, 191 8. 



Maggini, M., La Planete Mars en 191 8, L'Astronomie, 32, 

 261, 1918. 



Variable and Double Stars. — Luizet, M., Eph£merides des 

 Etoiles variables pour l'annee 191 7, Journ. des Observateurs, 

 2, No. 8, 191 8. 



Henroteau, F., A Spectroscopic Study of /3 Canis Majoris, 

 Lick Obs. Bull., No. 311, 1918. A Spectroscopic Study of <r 

 Scorpii : The Radial Velocities of the Stars e and 7 Orionis, 

 Lick Obs. Bull. No. 314, 191 8. 



Campbell, Leon, Observations of 323 Variable Stars during 

 years 1911-19, Harvard Annals, 79, pt. i. 1918. 



Union Observatory, Observations of Variable Stars, Union 

 Obs. Circ, No. 42, 191 8. 



Sanford, R. F., The Orbit of the Spectroscopic Binary, 

 p Velorum, Lick. Obs. Bull. No. 315, 191 8. 



Aitken, R. G., The Orbit of Sirius, Lick Obs. Bull. No. 316, 

 1918. 



Stellar Motions, etc.— Dyson, Sir F. W., and Thackeray, 



