OF ARTS AND SCIENCES. 115 



" The declination of the comparison star Bessel XIV. 424, used at 

 Markree on the 2d, 3d, and 5th of June, is apparently wrong. 



" In the four observations at Markree where the planet was referred 

 to this star, the mean between the declinations given by Professors 

 Challis and Rumker has been assumed for the comparison star, and the 

 planet's south declination therefore diminished by 7". 1. 



" In the star to which the planet was referred at Markree on the 18th 

 and 19th of May, the conclusion of Mr. Graham, that there is an error 

 of 4' in the R. A. of 4848 Br. Assoc. Catal., is evidently correct. The 

 observations of Metis on those days harmonize much better with the 

 rest of the series, however, by taking the position of the star there given, 

 with this correction, than by taking the one which Mr. Graham obtain- 

 ed on the 25th of May, and the former has therefore been used for the 

 comparison. The other determination gives, — 



Ax A? 



70 — s'.'l -f6"6 

 72 —9.1 4-5.6 



" The right ascension of the Cambridge observation of May 16 (A. 

 S. Notices, p. 177) is given 14''' 33™- 47* .46, where the minutes should 

 evidently be 35, instead of 33. 



" In the Cambridge observation of July 27, as given in the Notices 

 of the Astr. Soc, p. 206, there is an error in the right ascension of 20 

 seconds of time. The observation clearly was 14^ 28'"- 42'. 1. 



" Is there not a mistake of 1'"- in the Hamburg observations of May 

 15th and June 6th, and the Cambridge Mer. of June 5th ? 



" From three normal places for April 28.5, June 16.5, and August 

 4.5, I have computed three different ellipses, the normal places difTer- 

 ing from one another according to the number of observations from 

 which they were constructed. The observations of Professor Challis 

 at Cambridge in England, on the 4th of August, have been of great 

 service, and contributed in a high degree to the precision of the new 

 orbit. The fact that so small and faint an object was observed so near 

 the sun, three weeks after any other published observations, furnishes 

 of itself a sufficient tribute to the skill and unwearied efforts of the 

 observer, and the great power of the Northumberland equatorial. It 



