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sets of values for the coordinates of the apex and the precession. 
The set used by me is as follows: 
A = -+ 276° D= 34; 
/ 1 
precession = prec. of Auw.-Bradley X \ 1 abe 
Besides to the proper motions in Declination of Auwers, the 
following preliminary corrections had been applied: 
Declination. Correction. 
Southern Decl. — 0",008 
Decl. 0° tot + 20° — 8 
» +20 » +40 oe 8 
> +40 » +60 — 5° (mean) 
» +60 » +90 =e 1 
According to the arrangement of the catalogue, I have calculated 
the systematic corrections of the P. M. in declination for these five 
belts, separately for the stars of a) Spectral Type I and unknown 
spectrum, b) Spectral Type II. 
They have been derived from the condition that = 7 must be 
zero for each half belt, viz. for the halves, in wich sin y is only 
pesitive or only negative. 
The expression of this condition is : 
Stt+Aws Ssiny=0û 
or 
ET 
A 
where A gs, taken constant in each half belt, is the correction, to 
be applied to the P.M. in declination. 
In order to get reliable results, the stars with small siz. 7, which 
evidently have small weight, were omitted. The calculations have 
further been performed separately for: 
Ist. sin z > + 0.80; 2nd, an 7% > + 0:60 . 
19* 
