490 
ASTRONOMY: H. RAYMOND 
the fact that the stars' ^spread' in distance tends to produce a false 
elongation of the velocity-figure in the direction apex-antapex. This 
tendency is stronger the greater the spread, the smaller the velocity- 
figure relative to solar motion, and the more nearly spherical the figure. 
The last two causes, and possibly the first, operate strongly in the B 
stars. There is no appearance of such an effect in the other groups. 
5. The separation of groups "S" and "L" was made some years ago, 
for a different purpose, and according to a method which made allow- 
ance for solar motion relative to group S, but not enough for L, and 
made none for preferential motion. Consequently, while S no doubt 
represents fairly well the smaller motions, L does not truly represent the 
large ones. In group ''All," while the large motion characters are 
diluted by large numbers of small motion stars, the former have in- 
dividually much more weight than the latter; this therefore is probably 
more representative that L of the large proper-motion stars. A re- 
division into small and large proper-motions, on principles better adapted 
to the purpose of this investigation, is in progress. 
1 London, Rep. Brit Ass., 1905, (257). 
2 London Mon. Not. R. Astr. Soc, 67, 1906, (34). 
^Gottingen, Nachr., Math.-Phys. KL, 1907, (614); 1908 (191). 
*Medd. Lunds Astr. Obs., (Ser. 2), No. 9, 1913. 
'Ibid., No. 59, and (Ser. 2), No. 13, 1914-15. 
^London Mon. Not. R. Astr. Soc, 75, 1915, (521).. 
Ubid., 76, 1915, (121). 
^Astr. J. Boston, 612, 1910, (98). 
Ubid., 676, 1915. 
10 614, 623-i, 1910-11. 
