STARS IN COMA BERENICES. 361 



this case, zero was therefore assumed. The results reached 

 were as- follows : 



A. G. C— Radcliffe 1868 == + 0^033 

 A. G. C— Radcliffe 1870 = — 0^071 

 A. G. C— Radcliffe 1871 == — 0^020 



Greemvich An7mals (35). — The same systematic corrections 

 were used as are given by Auwers for the Ten-Year Catalogue. 

 See Davis, p. 24, no. 40. 



A few of the catalogues deserve special notice in this connec- 

 tion. They are : 



(i) Aiiwers-Bradley. — No systematic corrections to this cat- 

 alogue have been published by the author, which indicates that 

 their value is zero. I have so assumed it for the two stars 

 found in this list. 



(4) d'Agelet. — Auwers gives systematic corrections to this 

 catalogue on p. 60 of his zone of the A. G. C, but applying 

 only within the limits of that zone. On page 30 of the intro- 

 duction, Gould himself gives the result of a comparison with 

 Piazzi. His terms are not quite clear, however. He gives cor- 

 rections for what he calls the first and second group, without 

 stating where the dividing line between the groups is situated. 

 I have assumed it to be at 1 2'' in accordance with a statement 

 at the bottom of page 29, and find thus 



Piazzi — d'Agelet in a = -|- 0^.079 

 Piazzi — d'Agelet in tJ = -(-- i^''.22, 



whence (A. G. C. — d'Agelet) is easily obtained. 



(6) Struve. — The same correction was assumed to apply to 

 the " Catalogus Specialis " for 1824 as to the " Catalogus Gen- 

 eralis " for 1830. 



(17) Argelander. — In accordance with pp. vi and ix of the 

 introduction, the corrections of the Abo Catalogue reduced to 

 1855, as given by Auwers, were applied to my stars found in 

 this catalogue. 



(12), (19), and (26) Paris. — The corrections given by Au- 

 wers for the first twelve hours of right ascension were assumed 

 to apply equally to the third quadrant. 



Annals N. Y. Acad. Sci., XII, February 14, 1900 — 23 



(21) 



