STUDIES IN STELLAR STATISTICS. II. 55 
The 15", 16" and 17" columns give the rectangular galactic 
coordinates of the stars, taking the sun as the centre of the system 
of coordinates. These values are expressed in Siriometers, without 
decimals. When the values of R are surer known for the different 
subclasses (I think especially on the subclass 40) more accurate values 
may be easily deduced from-the values of 5”, 7° and & given, with 2 
decimal places, in the columns 10, 11 and 12. 
The 18" column gives the distance — »? — of the star from the 
"sun and the 19% column gives the corresponding parallax computed 
with the help of the formula 
na = ()''.206265 : 7? 
The 20^" column gives the distance —-7° — from the centre of 
the galaxy and finally in the 21%, 22" and the 23° columns the galac- 
tie eoordinates are given referred to the centre as origin. 
