302 Trans. Acad. Sci. of St. Louis. 



In these comparisons the distances have been grouped with- 

 out regard to position-angle, and the position-angles without 

 regard to distance. The individual comparisons however in- 

 dicate no systematic error in either co-ordinate which is a 

 function of the other. 



The results show a systematic difference in measures of dis- 

 tance which is apparently constant for all distances. 



The comparison of position-angles on the other hand show 

 small differences (except in one case depending on a small 

 number of observations) and these differences are, I think, 

 purely accidental, in spite of the similarity of sign in the first 

 and third, and second and fourth, quadrants. 



The following tables give the individual results. The 

 powers employed were 300, 600 and 800 and these are indi- 

 cated by the letters C, D and E respectively. 



In the Mean Results, which follow the individual observa- 

 tions, I have added for comparison my observations of these 

 same pairs made in 1880, 1881 and 1884. 



The Right Ascensions and Declinations refer to the Equinox 

 1900.0. 



