cxxxn 



COMPARISON-STARS. 



If we include in this examination those stars hereafter cited, which were observed with Mars 

 on the meridian, althoiigh not strictly comparison-stars, we find that all but one of these 

 eighteen are also in the Catalogue of the British Association. The catalogue places of these 

 thirty-one stars are here annexed. 



Comparison-Stars from British Association Catalogue. 



Comparing these thirty-one declinations with the values here determined, and assuming the 

 latter to be correct, we find 



The average discordance, d = 4". 06, 

 The mean error, s =. 6". 15 ; 

 or, excluding those stars whose places depend upon Lacaille, 



e = 3".50. 



Lacaille's positions have not been employed, inasmuch as, after careful examination, they 

 seemed unlikely to add to the precision of the results. 



The following General Catalogue of Comparison-Stars presents the adopted mean places for 

 the beginning of the year of observation, together with the annual precessions and the constants 

 for reduction to apparent places. 



