76 



MEMOIRS OP THE NATIONAL ACADEMY OF SCIENCES. 



The place of the British Catalogue 1007, when corrected by — 20» or — 5' in right ascension, as 

 Argelander proposes, is 



103° 22' 5"; +17° 26' 30" 

 Difiereuce (Pi.— Fl.] +i' IT"; - lo~38^3''. 



lutheHistoria Coelestis, II, p. 250, the observed zenit distance for B. Fl. 1007 is given asoio o' 45" ^ 

 for the star immediately following, which is 51 Geminorum,'iiP 50' 20" (this should be, rather, 34° 

 55' 20", if corrected according to the reading ^cr strias cochleev, which here is right). The star 

 No. 1007 was therefore north of 51 Oeminonim by 49' 35", which is so neaily half of the difference 

 between Pi. 340 and Flamsteed's star that, through applying it with a wrong sign, as it seems, Ar- 

 gelauder was misled to the identification with Pi. 346. 



7 and 8) 



B. Fl. 1198 (6°') and 1199 (G"'). 



These stars are but very imperfectly observed (see Historia Ccelestis, II, p. 287, 1096, January 

 23); the times were not recorded and the zeuit distances read off only approximately j[>er /t«eas 

 diagonales. They transited 



between B. Fl. 1232=7 Ursaj maj.=Dm. + 61o 1070 (7, 5"') : S"" 31°' 5^; +61° 25',6 

 and B. Fl. 1235=0 Ursa} maj.=Dm.+65o 073(6,0"'): 8" ll-" S'*; +65° 9',0. 



There are in the Durchmusterung zone for +49° between these right ascensions no other stars 

 of sufficieut brightness for possibly being seen in Flamsteed's telescope than the following, viz: 



Dm. 1758 (S"'3), 1759 (0"'8), 1766 (7'"5), 1768 (8'"5), 1771 (8'"4), 1772 (7"9), 1776 (8-"2). 



Only the two brightest ones of them agree with the condition imposed by the zenit distances 

 as far as recorded. Eeduced to 1696 they are: 



Dm. +490.1759 (=LL. 17058-9=:Pi. 8''.13]) : 8'' 21''' 40=; + 49° r.i' 8 

 Dm. +49 .1706 (=LL. 17138 =Pi. 8.141) : 8 24 3 ; + 40 56,3, 



which give the apparent zenit distances, south 1° 40', while Flamsteed's readings were mist. 1° 30', 



and south 1 38, and aust. 1 35. 



These two stars, therefore, well satisfy the roughly taken observations. Argelander had 

 come to the same conclusion, from which Baily, however, dissents, without giving anything better 

 in its place. 



9 and 10) 



B. Fl. 1205 and 1212. 



The stars in and around Prwscpe, contained iu the British Catalogue, with the right ascen- 

 sions converted from arc into time, are shown iu the fii'st five columns of the following table: 



