12 



Froceedings of the Royal Irish Academy. 



have been eorreeted by the tables published by Professor Auwers 

 (Astr. jN'achr. 3842-44), a most necessary operation, since the 

 systematic errors, particularly in the Cambridge zones, are very 

 considerable. The following places are for 1899-0, the reductions to 

 apparent place being given in the last column. The figures in 

 brackets represent the number of observations. 



(1) + 29°-256 ^lag. 8-3 : 



Leiden, P 26™ 5'-61 (2) + 30" 6' 20"-0 (2) 

 Cambridge, 5-67(6) 19-6 (6) 



Adopted, 1 26 5-65 + 30 6 19-70 + 4^-99 + 33"-l7. 



(2) + 30°-240 Mag. 8-9 : 



Leiden, 1^ 27"^ 42^-21 (2) + 30° 25' 47"-0 (2) 

 Dunsink, 42 -22 (4) 47 -5 (4) 



Adopted, 1 27 42-22 +30 25 47-30 + 5^-01 4- 33-"17. 



(3) + 29°-260 ^klag. 8-0 : 



Cambridge, 1^ 27"^ 56^-56 (4) + 29° 52' 15"-3 (4) 

 luistner, 56-44(2) 15-44 (2) 



Adopted, 1 27 56-50 +29 52 15 -37 + 5^-00 + 32"-99. 



(4) + 29°-265 Mag. 9-2 : 



Leiden, 1'^ 29"^ 35^-44 (2) + 30° 9' 15"-8 (2) 

 Cambridge, 35-41(8) 16-4 (8) 



Komberg, 35 -51 (4) 16 -9 (4) 



Adopted, 1 29 35-49 + 30 9 16-53 + 5^-03 + 32"-96. 



As the fourth star is belovr the ninth magnitude, I thought it 

 best to omit the Cambridge observations, on account of their large 

 systematic error depending on magnitude. As the centre of the 

 plate I adopted 



A = V 28" 30^-00 ) 



D = +30° 6' 50-0 j ^^PP-^-t Equinox. 



The following quantities were found : — 

 Ey stars (1) and (4) : 



P = - 0-000075, Q = - 0-002629, "| = -107"-70, = + 7"-62. 



Ey stars (2) and (3) : 



P = - 0-000428, Q = - 0-002559, J = -106"-57, "77 = + 6"-84 



