STAR CATALOGUES 115 



La Caille, Tobias Mayer, Cagnoli, Piazzi, Zach, Pond, Taylor, 

 Groomliridge, Argelaiider, Airy, Brisbane, and Hiimker. 



We here only allude to those works which enumerate a 

 great and important part* of the stars of the seventh to the 

 tenth magnitude which occupy the realms of space. Tho 

 catalogue known under the name of Jerome de Lalandi's, 

 but which is, however, solely based on observations made by 

 his nephew, Francois de Lalande, and by Burckhardt between 

 the years 1789 and ISOO, has only recently been duly appre- 

 ciated. After having been carefully revised by Francis Baily, 

 under the direction of the " British Association for the Ad- 

 vancement of Science" (in 1847), it now contains 47,390 

 stars, many of which are of the ninth, and some even below 

 that masfnitude. Harding, the discoverer of Juno, cataloo-ued 

 above 50,000 stars in twenty-seven maps. Bessel's great 

 work on the exploration of the celestial zones, which comprises 

 75,000 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^ 

 docl., by Argelander at Bonn. AYeisse of Cracow, under the 

 auspices of the Academy of St. Petersburgh, has reduced 

 31,895 stars foi the year 1825 (of wliich 19,738 belonged to 

 the ninth magnitude) from Bessel's zones, between — 15° and 

 4-15° decl. ;t and Argelander's exploration of the northern 

 heavens from +45° to +80° decl. contains about 22,000 

 well-determined positions of stars. 



* I here compress into a note the numencal data taken from star cat- 

 alogues, containing lesser masses and a smaller number of positions, 

 with the names of the observers, and the number of positions attached : 

 La CaiUe, in scarcely ten months, during the years 1751 and 1752, with 

 instruments magnitying only eight times, observed 9766 southern stars, 

 to the seventh magnitude inclusive, which were reduced to the year 

 1750 by Henderson ; Tobias Mayer, 998 stars to 1756 ; Flamstead, orig- 

 inally only 2866, to which 564 were added by Baily's care {Mem. of the 

 Astr. Soc, vol. iv,, p. 1291-64); Bradley, 3222, reduced by Bessel to 

 the year 1755; Pond, 1112; Piazzi, 7646 to 1800; Groombridge, 4243, 

 mostly circumpolar stars, to 1810 ; Sir Tliomas Brisbane, and RQmker, 

 7385 stars, observed in New HoUand in the years 1822-1828 ; Air}^, 2156 

 stars, reduced to the year 1845 ; Riimker, 12,000 on the Hamburg hori- 

 zon ; Argelander (Cat. of Abo), 560; Taylor (Madras), 11,015. The 

 Bi-itish Association Catalogue of Stars (1845), drawn up under Baily'a 

 superintendence, contains 8377 stars from the first to 7^ magnitudes. 

 For the southern stars we have the rich catalogues of Henderson, Fal» 

 lows, Maclear, and Johnson at St. Helena. 



t Weisse, Posillones medice sfellanan Jixarum in Zonis Regiomontani» 

 a Besselio inter — 15° ei +15° decl. observalarum ad annum 1825 re 

 iucfic (1840); with an important Preface by Struve. 



