1891. ] NEW YORK ACADEMY OF SCIENCES, 91 
Louse, J. G.—Meridian Observations of Comet 0 1881. I., 177. 
— Meridian Observations of Comet c 1881 (Schaeberle). I., 182. 
——Observations of Encke’s Comet. [I., 182. 
——| Discovery of a Variable Star; Comet e(Barnard); Notices of.] I., 
206 
——Observation of the Transit of Venus, 1882, December 6, at Dun 
Echt Observatory. III., 129. 
— Spectroscopic Observations of Comet 1683 I. (made at Dun Echt 
Observatory with the Grubb Spectroscope). III., 130. 
OPPENHEIM, H.—Elemente und Ephemeride des Cometen a 1881. I., 
21 
Elemente und Ephemeride des Cometen e 1881 (Barnard). L., 
221. 
Elements of Comet g 1881 (Swift). II., 20. 
OUDEMANS, J. A. C.—Reply to the Remarks of Dr. Copeland on my 
Calculation of the Place of the Comet of 1733 (this Journal, p. 
165). I., 207. 
PerrRY. 8S. J.—The Chromosphere in 1880. I., 97. 
— The Chromosphere in 1881. II., 62. 
—The Government Expedition to Madagascar to observe the Tran- 
sit of Venus, on December 6, 1882. III., 67. 
—tThe Chromosphere in 1882. III., 102. 
—The Chromosphere in 1883. III., 232. 
Peters, C. H. F.—Positions of Nebule, Series I. I., 51. 
—Positions of Nebule, Series II. II., 54. 
PICKERING, E. C.—Remarkable Star Spectrum; New Planetary Nebula. 
I., 242. 
PLumMer. W. E.—On the Theory of the Sidereal System proposed by. 
Mr. Maxwell Hall. II., 45. 
——On the Orbit of Denning’s Comet (1881 V.). III, 1. 
Rapav, R.—Remarques concernant le Probléme de Kepler. III., 182. 
[RopGERS, JoHN.|—The U. S. Naval Observatory during the Year end- 
ing October 31, 1880. I., 48. 
Rosse, THE EARL OF.—Determinations of the Lunar Radiant Heat dur- 
ing the Progress of an Eclipse. I., 22. 
SCHJELLERUP, H. C. F. C.—Recherches sur |’Astronomie des Anciens, 
I., 25, 41, 228. 
——Supplement aux Tables écliptiques de P. A. Hansen. I., 155. 
—On some hitherto Unknown Observations of a supposed Satel- 
lite of Venus. II., 164. 
— Christian Mayer’s Observations of Telescopic Stars, arranged ac- 
cording to Constellations. III., 57. 
ScuuLHor, L.—Eléments et Ephémeride de la Cométe Denning. I., 
222. 
ScHWEDOFF, TH&O.—Sur les Configurations des Cométes. III., 123. 
——Sur la Queue Multiple de la Cométe de 1744. III., 182. 
Srone, O.--On the Determination of the Error and Rate of a Clock by 
the Method of Least Squares. I., 116. 
——Note on the Computation of Special Perturbations. II., 120. 
TACccHINI, P.--Comet g 1881. I., 2389. 
——Osservazioni della Cometa Wells fatte al Osservatorio del Col- 
legio Romano, I1., 96. 
