It is evident from a comparison of these numbers that the four 

 stars have preserved (within the limits of the errors of observation) 

 the same relative positions to each other. Hence we may infer, 

 that the proper motion of each has been imperceptible during that 

 time. Therefore the difF. of right ascension and N. P. D. for 1 765, 

 above given, being corrected for difF. of precession between 1 765 

 and 1825, and then compared with the difference for 1825, the 

 proper motion of « Aquilae in R. A. and N. P. D. is obtained from 

 each star as in the following 



TABLE. 



mean — 21,87 



STARS NEAR « CYGNI. 



