STUDIES IN STELLAR STATISTICS. II. 11 
We thus get 
22, = 4.488 
(11) D = + 34°.42 
A = 273° 48 
The value 4.4 Siriometers per stellar year corresponds to (com- 
pare Meddel. N:o 70) 
21.26 km/sec , 
somewhat greater than the usually accepted value of the velocity of 
the sun. GYLLENBERG obtains, from all B-stars, 2, = 4658 Sir/st. = 22.06 
km/sec. The coordinates of the Apex agree well with the values of 
the eoordinates obtained from the proper motions of the stars. 
Taking into account the mean errors of the components of the 
velocity, we are not entitled, from the present material, to accept a 
systematic motion of the B-stars relative to the other stars of the 
Milky Way '. 
7. Proceeding now to consider the proper motions of the same 
stars we have to treat equations of the form 
1 UEM SC NUN 
(12) ul = yug UE yn BV" tym BW 
and 
12* RE L U" fits 1 pa 27 L w" 
(12°) Ü Yu Rp Ya Pp 72 P > 
the former being deduced from the proper motions in right ascension, 
the latter from those in declination, 
It is to be observed that y, = 0. Hence we are able to deduce 
I l 
from (12) the mean values of R U" and h V" and from (12*) the mean 
! [n all computations in this memoir | have used the value 4.488 Siriometers for the 
velocity of the sun. The obtained values of À may be reduced to a velocity of the sun 
equal to 20 km/sec through multiplying by 0.9407. 
