1891.] NEW YORK ACADEMY OF SCIENCES. 95 



the observation on a systematic plan of the comparison Btars used 

 in the observations of planets and comets, and for which satisfac- 

 tory catalogue places cannot be found. 



Sidereal System, On the Theory of the, proposed by Mr. Maxwell Hall. 

 By W. E. Plummer. II., 45. A review and examination of Mr. 

 Hall's paper published in the 43d vol. of the Memoirs R. A. S., in 

 which the author attempts " to connect Proper Motion with Annual 

 Parallax, and with the radial velocity of the fixed stars." From 

 the tests which he applies to Mr. Hall's theory, Mr. Plummer re- 

 gards the latter's results as inconclusive and untrustworthy. 



Telescopic Stars, Christian Mayei-'s Observationsof, arranged according 

 to Constellations (H. C. F. C. Schjellerup). III., 57. 



VI. SPHERICAL ASTRONOMY, 



Polhohe, Ueber eine Methode die, moglichst frei von systematischen 

 Fehlern zu bestimmen. Von Prof. J. C. Kapteyn. III., 147. 



Precession, Constant of, A New Determination of the. By J. L. E. 

 Dreyer, Ph.D. II., 185. Contains a description of the previous 

 labors of Bessel, Struve, and Nyren on this subject. Dr. Dreyer 

 takes as the basis of his work Lalande's " Histoire Celeste" and 

 Schjellerup's catalogue of 10,000 stars, and deduces a result which, 

 for 1800.0, is only 0".0046 less than the Slruve-Peters constant. 



Right Ascensions. Lalande's, Note on the Accuracy of. By J. L. E. 

 Dreyer. III., 103. 



VII. THEORETICAL ASTRONOMY. 



A Comparison of Le Verrier's Tables of Uranus and Neptune with 



those by Newcomb of the same Planets. By David P. Todd, M.A. 



III., 233. 

 Kepler'sche Problem, Ueber das. Von Prof. J. C. Kapteyn. III., 25. 

 Kepler^ Remarques concernant le Probleme de. Par M. R. Radau. III., 



132. 

 Lambert'schen Gleichung fiir parabolische Bewegung, Ueber die Auf- 



losung der. Von Prof. W. Klinkerfues. I., 5. 

 Problems der Drei Korper, Eine neue Behandlung des. Von Dr. H. 



Kobold. II., 69. 

 Problem der Drei Korper, Bemerkung zu Dr. H. Kobold's Aufsatz tiber 



das. Von Prof . Aug. Weiler. II., 130. 

 Special Perturbations, Note on the Computation of. By Ormond Stone. 



II., 120. 

 Theorie der Bewegung der Himmels-Korper, Prof. Gyldcn's Neue Un- 



tersuchungen uber die. Von Dr. O. Backlund. II., 203. 

 Wahren Anomalie, Ueber den zweiten Differentialquotienten der. Von 



W. Klinkerfues. II., 163. 

 Wahren Anomalie genommen, Ueber den zweiten Differentialquoti- 

 enten von X nach der. Von August Weiler. III., 16. 



VIII. ASTRONOMICAL BIBLIOGRAPHY. 



" Cycle," A few Addenda to Admiral Smyth's (Editors). II., 93. 



Manuscript der PulkowaerSternwarte, Ueber ein altes. Von A. Wagner. 

 II., 123. An Arabian manuscript containing data concerning the 

 annual increase in the mean longitude of the sun, from which M. 



