30 



GOULD — REDUCTION OF D AGELET S OBSERVATIONS. 



The resultant differences Piazzi — d'Agelet are — 



A a 



s. 

 = + 0.119 

 = + 0.121 

 = + 0.087 

 = + 0.079 

 = + 0.106 

 = + 0.102 



A (5 = — 1.36 by 2,719 observations in first group ; 

 = — 1.42 by 983 stars in first group ; 

 = + 1.25 by 1,945 observations in second group ; 

 = + 1.22 by 807 stars in second group; 

 = — 0.27 by 4,664 observations in all ; 

 = — 0.23 by 1,790 stars in all. 



Those stars which occup in Piazzi's catalogue have not been collated with Lalande. but for 

 the others an analogous comparison has been instituted with Baily's reductions of the Histoire 

 Celeste. The results of this collation for about 850 stars, after applying a few proper-motions 

 and rejecting the differences in right-ascension for 26, and in declinations for 14 stars, are as 

 follows : 



Comparison with Lalande. 



(30) 



