1891.] NEW YORK ACADEMY OF SCIENCES. 101 



Venus, Transit of, Observation of the, 1882, December 6, at Markree 

 Observatory. By W. Doberck. III., 19. 



Ibid., The Government Expedition to Madagascar to observe the, 



on December 6, 1882. By the Rev. S. J. Perry, F.R.S. III., 67. 

 -Ibid., Observation of the, December 6, 1882, at the Observa- 



tory of Queen's College, Cork. By Prof. J. England. III., 75. 

 Ibid., Observation of the, 1882, December 6, at Dun Echt Ob- 

 servatory. By J. G. Lohse. III.. 129. 



XIII. MARS. 



Mars in 1881-82, Note on the Aspect of. By C. E. Burton. II., 91. 



XIV. JUPITER. 



Jupiters, Beitrag zur Kenntniss der Rotationselemente. Von Dr. H. 

 Kobold. I., 123. 



XV. NEPTUNE. 



Neptune, Historical Note concerning the Discovery of. J. L. E. Dreyer. 

 II., 63. Dr. Dreyer shows that d' Arrest as well as Galle took part 

 in the observations that finally resulted in the discovery of Nep- 

 tune. 



Neptune, Ueber die erste Auffindung des Planeten. J. G. Galle. II., 96. 



XVI. MINOR PLANETS. 



Kleiner Planeten, Beobachtungen, am Reichenbach'schen Meridian* 

 kreise zu Gottingen (Dr. H. Kobold). I., 94. Observations during 

 1880 of Nos. 3, 4, 5, 6, 7, 11, 14, 15, 20, 40, 43, 51, 78, 119. 



Prize Question of the Royal Danish Society of Science. III., 51. The 

 Society here offers a gold medal "for a statistical investigation of 

 the orbits of the Minor Planets, considered as parts of a ring around 

 the sun." 



XVII. NEBULAE. 



Merope, Note on the Nebula near. By J. L. E. Dreyer. I., 156. 



Nebulae, New. By A. Ainslie Common. I., 50. 



Orion, Photograph of the Nebula in (Editors). I., 160. Notice of the 



photograph of this object taken by Prof. Henry Draper on March 



11th, 1881. 

 Orion, The Spectrum of the Nebula in, photographed (Editors). II., 68, 



Notice of Dr. Huggins' photograph of the spectrum taken on March 



7th, 1881. 

 Planetary Nebula, A New. By Ralph Copeland, Ph.D. I., 2. 

 Planetary Nebula, New. Edward C. Pickering. I., 242. 

 Positions of Nebulae. Series I. By C. H. F. Peters. I., 51. 

 Ibid., Series II. By C. H. F. Peters. 11., 54. 



XVIII. DOUBLE STARS. 



Double Stars, Recent Measures of. By C. E. Burton. I., 54. 



Double Stars. On some Interpolation Formulae for. By Prof. T. N. 

 Thiele. II., 25. A very complete discussion of the most advanta- 

 geous formulge for the computation of double star orbits, under 

 varying conditions as regards the data to be used. Contains also a 

 set of auxiliary tables. 



