424 



COMPARISON OF CATALOGUES OF STARS. 



Secondary Catalogue. 



The extraordinary agreement of the reduced positions of Safford, Newcomb, and 

 Boss, especially in declination, with the Normal System, will not escape attention. 

 It cannot be expected that any single catalogue will exhibit the same degree of 

 agreement, especially if, as is the case with the Harvard College Catalogue, it has 

 been constructed from observations made subsequent to those upon which the Normal 

 System is founded. It is probable therefore that in a majority of the cases in which 

 the deviations from the normal system are large, the residuals represent accidental 

 errors of observation in the present catalogue. 



To this class probably belong the following stars : — 



In Right Ascension. 



c Persei. 

 o 1 Eridani. 

 10 Camelopardi. 

 ij Leonis. 



£ Ursa? Majoris, med. 

 y Virginia. 



Groombridge 2415. 



In Declination. 



55 Cassiopeia?. 

 67 Ceti. 



Groombridge 716. 

 9 H. Camelopardi. 



Groombridge 848. 

 12 Canum Venaticorum, seq. 



4 TTrsae Minoris. 

 109 Virginia. 

 8 Bootis. 

 8 Aquilae. 

 v Cygni. 

 (3 Aquarii. 



On the other hand, I shall be disappointed if future observations do not confirm 

 the substantial accuracy of the values given for the right ascensions of the following 

 stars, viz. ; Groombridge 29, -q Cassiopeia, 36 Camelopardi, 1 H. Draconis, Groom- 

 bridge 2164, 6 Draconis, 17 Draconis, Groombridge 2377, b Draconis, y8 Lyrae (per- 

 haps), Groombridge 2900, and v Pegasi. The discussion of positions which are 

 apparently erroneous will be reserved for another paper. It will, however, be in- 

 structive to record the present state of the testimony with respect to these stars as 

 given in the discussion of Dr. Auwers, to which are added the positions from this 

 catalogue instead of the places taken from Vol. X. of the Annals. Both coordinates 

 are for 1875.0. 



