88 TRANSACTIONS OF THE [MAR. 2, 
Urania. After six numbers had been issued, becoming aware 
of the existence of an astrological journal of the same name, the 
editors changed the appellation of their publication to Coperni- 
cus, under which name three complete volumes were published, 
the last number of the journal being dated in June, 1884. The 
discontinuance of the publication of Copernicus was a source of 
great regret to astronomers, for it occupied a unique position 
among the journals of its class—a position which, to a very 
large extent, has never been occupied by any other publication. 
It is with a view of furnishing a means of reference to the 
many valuable papers of permanent interest contained in Coper- 
nicus that the following index has been compiled. It is hoped 
that it will be found to be a worthy contribution to astronomical 
bibliography. 
The index is arranged in two parts: the first contains a list 
of contributors to the journal, with the titles of their papers or 
articles in chronological order; the second part contains the 
contents of the journal, arranged under the various general 
subjects to which the papers respectively belong. 
The Roman numerals refer to the volumes, the Arabic to the 
pages. 
The critic will note various departures from the established 
rules which are supposed to govern the formation of a biblio- 
graphical index. In extenuation it may be said that no attempt 
has been made to follow closely the usual forms and methods, 
but that the object has been to present the material in the 
most available form. 
PART I. 
Names of authors and contributors, with the titles of their papers, 
articles, and notes, 
BACKLUND, O.—On the Parallax of the Star Bradley, 3077. II., 201. 
—Prof. Gyldén’s Neue Untersuchungen iiber die Theorie der Be- 
wegung der Himmelsk6rper. II., 208. 
BAKHUYZEN, H. G. vy. d. S.—Observations of Brooks’ Comet (Comet of 
1812), September 5th and 8th, 1888. III., 131. 
BALL, R. S.—Researches on the Annual Parallax of the Star Groom- 
bridge, 1618, JI., 16. 
——Determination of the Annual Parallax of 6 Cygni B = = 2486, 
Ty too: : 
BOrGEN, C.—Hiilfstafeln zur Erleichterung der Berechnung von Stern- 
bedeckungen durch den Mond. L., 8. 
———Corrections to Dr. Borgen’s paper on Occultations [Ed.]. I., 49. 
BREDECHIN, TH.—Sur les Queues des Cométes. I., 99 
—Recherches sur les Cométes b et c 1881. II., 1. 
—Note supplémentaire sur les Cométes 6 et ¢ (III. et IV.) 1881. 
IT.; 56; 
—Sur la Cométe 1882 I. (Wells). III., 41. 
