377 
1908-9.] The Systematic Motions of the Stars. 
Blaikie’s “ spherical slide rule ” admits of more accuracy, these angles were 
only determined to the nearest degree. 
2. The material used differs slightly from that of the former paper. 
The proper motions of Professor Porter’s Catalogues, Nos. 13 and 14 of the 
Cincinnati Observatory Publications, were substituted for those of No. 12. 
Additional proper motions were obtained from two papers by Dr Ristenpart 
in the Astronomische Nachrichten, Nos. 4245 and 4276, and from a list of 
proper motions of the stars observed by Carrington, determined at Green- 
wich, and published in the Monthly Notices of the Royal Astronomical 
Society , vol. lxviii. p. 48, and a few from other sources. To facilitate 
arrangement of the stars in different groups a card catalogue was 
made. 
3. In order to show clearly the method pursued, a table is given of 
the stars whose proper motion equals or exceeds 100" a century. For each 
star the name, magnitude, type of spectrum, and approximate R.A. and Dec. 
for 1900 are given. The magnitudes are taken from the “ Revised Harvard 
Photometry ” (vol. 1 ., Harvard Annals), the “ Harvard Photometry ” (vol. 
xiv.), or the “ Harvard Photometric Durchmusterung ” (vol. xlv.), in the 
order given. The magnitudes of fainter stars are mainly derived from 
the Catalogues of the Astronomische Gesellschaft and the Cape Catalogue 
of Astrographic Reference Stars. The type of spectrum is obtained from 
the “ Revised Harvard Photometry ” or the “ Draper ” Catalogue. The 
amount and direction of the centennial proper motion are next given ; 
then the angle AST (positive when PSA > PST) and the angle SA 
under the headings A, a ; then the angles BST and SB. 
The assumed positions of A and B are — 
A . R.A. 90° Dec. - 10° ) 
B . . . 255° „ -60° i 
These agree closely with the mean of the positions determined by 
Kapteyn, Eddington, and myself, and quoted at the end of my previous 
paper. 
[Table. 
