COMPARISON-STARS. 



CXXX1 



A few of these stars exhibit indications of a proper motion, which, although hardly marked 

 enough to warrant the adoption of any theory upon the subject, yet render it proper to intro- 

 duce into the ultimate determination from the data at command a term dependent upon the 

 time. This has been done for four stars, viz: N os - 12, 94, 101, and 1 )9 ; and the redetermi- 

 nation of these upon the hypothesis of a proper motion gives the following results. The second 

 column shows the place as given by the observer, after reduction to the mean equinox of the 

 epocli ; and the third contains this observed place as reduced to the scale of the standard 

 observer. The remaining two give the assumed place and the residual discordance, upon the 

 supposition of a proper motion : 



Fourteen of our 148 stars are to be found in the Catalogue of the British Association, viz : 



To eight of these stars a proper motion is assigned in the British Association Catalogue. It 

 seems probable, however, only for two of these eight, and has in each case the contrary sign 

 to those deduced above. For N- 12, it is given as certainly not existing. 



The discrepance is generally great, amounting in one case to 2'- in right-ascension, and 

 20". 7 in declination. The average of the discordances in declination is 5."58, and the square 

 root of the mean of the squares is 8."1. 



