346 KRETZ. 



The mean date of observation is not given in the catalogue. It 

 was obtained from the original records, published in the "Annual 

 Results of Observations at Greenwich." All observations of small 

 stars were made in the years 1830 to 1833 incl. ; those of principal 

 stars in right ascension from 18 16 to 1833, ^^d in north polar dis- 

 tance from 1826 to 1833. There are, in general, two observations 

 in N. P. D. for each day, one with each of the two mural circles. 

 For one star (No. 501, decl.), more observations were found in the 

 annual results than are counted in the catalogue ; the same rule with 

 regard to the weight and the mean date was followed in this case as 

 in that of Piazzi. 



(8) TAYLOR, 1835. A General Catalogue of the 

 Principal Fixed Stars from Observations made * * * at 

 Madras in the years 1830 to 1843. Madras, 1844. 



The mean date is not given. It was obtained from the original 

 records in Vol's i to 5 of the Madras observations in a manner simi- 

 lar to that explained by Argelander on pp. 18 and 19 of Vol. VII, 

 Bonner Beobachtungen ; remembering however, that according to 

 the introduction to Vol. 3, the transit instrument was down from 

 1834 March 6th to 1835 Jan. 31st, and that Taylor was absent in 

 England in the years 1840 and 1841. Account was also taken of the 

 fact that the constellation Coma Berenices comes to the meridian 

 before midnight in the early part of the year. The star numbers as 

 printed in this paper were corrected according to the errata, pp. 6-8, 

 of the catalogue. 



(9) RUMKER, 1836. Mittlere Oertervon 12,000 Fix- 

 sternen * * * aus den Beobachtungen auf der Hamburger 

 Sternwarte * * * Hamburg, 1852. 



The mean date was taken as 1 841, in accordance with the note 

 given by Schorr in his " Bemerkungen zu Carl Riimkers Sterncata- 

 logen," Mitteilungen der Hamburger Sternwarte, No. 3, p. 6. 



(10) ROBINSON, 1840. Places of 5,345 Stars observed 

 from 1828 to 1854 at the Armagh Observatory. Dublin, 

 1859. 



The mean date was obtained from the record of the separate ob- 

 servations printed in the first part of the volume. 



(11) GILLISS, 1840. Catalogue of 1248 Stars ob- 

 served at Washington between October, 1838 and July, 

 1842 * * * Washington, 1846. 



The mean date was obtained from the annual results given in the 

 same volume. 



(6) 



