STAR CATALOGUES. 155 



tilde which occupy the realms of space. The catalogue known 

 under the name of Jerome de Lalande's, but which is, however, 

 solely based on observations made by his nephew, FranQois 

 de Lalande, and by Burckhardt between the years 1789 and 

 1800, has only recently been duly appreciated. After having 

 been carefully revised by Francis Baily, under the direction of 

 the " British Association for the Advancement of Science," (in 

 1847,) it now contains 47390 stars, many of which are of the 

 9th and some even below that magnitude. Harding, the disco- 

 verer of Juno, catalogued above 50000 stars in twenty-seven 

 maps. Bessel's great work on the exploration of the celestial 

 zones, which comprises 75000 observations (made, in the years 

 1825-1833 between 15 and + 45 declination) has been 

 continued from 1841 to 1844 with the most praiseworthy care, 

 as far as + 80 decl., by Argelander at Bonn. Weisse of Cracow, 

 under the auspices of the Academy of St. Petersburgh, has re- 

 duced 31895 stars for the year 1825, (of which 19738 belonged 

 to the 9th magnitude) from Bessel's zones, between 15 

 and + 15 decl. ; B and Argelander's exploration of the 

 northern heavens from + 45 to + 80 decl. contains about 

 22000 well determined positions of stars. 



I cannot, I think, make more honourable mention of the 

 great work of the star maps of the Berlin Academy, than by 

 quoting the words used by Encke, in reference to this under- 

 taking, in his oration to the memory of Bessel : " With 

 the completeness of catalogues is connected the hope that 



(Cat. of Abo,) 560 ; Taylor, (Madras,) 11015. The British 

 Association Catalogue of'Stars, (1845,) drawn up under Baily's 

 superintendence, contains 8377 stars from the 1st to 7^ magni- 

 tudes. For the southern stars we have the rich catalogues 

 of Henderson, Fallows, Maclear, and Johnson at St. Helena. 



* Weisse, Positiones mediae stellarum faarum in Zontt 

 Regiomontanis a Besselio inter 15 et + 15 decl. observa- 

 tarum ad annum 1825 reductce, (1846); with an important 

 Preface by Struve. 



