STARS IN COMA BERENICES. 357 



geometric precession from that quantity. The original author- 

 ity for the proper motions of all others than fundamental stars 

 is the B. A. C. See p. 134. 



(29) Proper motion is not used. 



(30) As in the other Greenwich catalogues, proper motion 

 is employed in the reductions. See Introd., p. 4. 



In the case of the Annual Results, proper motion has a very 

 slight effect as it is always used for a fraction of a year only, and 

 is therefore rather unimportant. I found, however, the following : 



(31) The Cambridge Annuals. Proper motion is not ta- 

 ken into account, except for Nautical Almanac Stars when 

 included in the annual variations there given. 



(32) The Edinburgh Annuals, up to the publication of the 

 B. A. C. in the year 1845, were reduced by means of the A. 

 S. C. and Nautical Almanac constants, using proper motion 

 only if therein included. After that, however, the B. A. C. 

 values, both of precession and proper motion, were always 

 used, if possible, for stars not given in the N. A. 



(33) The Radcliffe Annuals do not use proper motion. 

 For Nautical Almanac Stars it is, however, generally included 

 in the precessions ; these are marked with an asterisk in such 

 cases. 



(34) The Madras Annuals do not use proper motion. 



(35) The Greenwich Annuals employ proper motion in 

 the reduction to mean place. 



Systematic Corrections. — The system used throughout was 

 that of the '' FiDidaineiital- Catalog der Astvononiischen Gesell- 

 schafty Corrections to reduce the catalogue positions to this 

 standard are given by Auwers in the Astronomische Nach- 

 richten nos. 3195-96, and 3413-14. A number of lists of stars, 

 notably annual results, are not mentioned in these papers, how- 

 ever. For such cases it was generally possible to obtain values 

 of the corrections to the declinations from Boss, ''Report on the 

 Declination of Stars, etc.,'' pp. 579 ff They were reduced from 

 his " mean system " to the A. G. C. system by the aid of the 



(17) 



