494 
BOTANY: D. H. CAMPBELL 
leads to the inference that the velocities of the nearer stars are greater 
than for the distant stars. Such a condition is confirmed by the veloc- 
ities of 41 stars whose parallaxes have been observed to be 0."06 or 
over. Their average radial velocity is 26.9 km. (or 20.7 km. if we omit 
four stars with velocities of from 73 km. to 98 km.) whereas the average 
velocity of a large number of stars of similar magnitude and spectral 
class (including many stars of small fi) which are undoubtedly at a 
much greater average distance than the 41 stars, may be taken at 15 km. 
(or 10 km. if limited to small proper motion). 
Conclusions. — 1. The preference for motion in the direction of the 
ellipsoidal axis appears to be confined to the stars of larger proper motion 
and brighter than 3.0 magnitude in all of the spectral classes with the 
possible exception of K and M. The limit of proper motion below which 
little or no preference for the ellipsoidal axis is shown, appears to be 
about 0.''05. 
2. The increase in prolateness in the stars of large proper motion can 
be traced chiefly to the direction of the ellipsoidal axis. 
3. This relation to proper motion furnishes a satisfactory explanation 
of the peculiar behavior of the stars of class B. 
4. The radial velocities of the nearer stars are larger than those of the 
more distant stars. 
« 
5. When classified according to size of proper motion, and a few large 
motions are excluded, there is no certain increase in the radial veloc- 
ities of the different spectral classes. 
6. When the radial velocities are classified according to size of proper 
motion, there is no certain change with magnitude. 
The details of this investigation will be published in the Astro- 
physical Journal. 
1 Berkeley, Lick Obs., Univ. Cal. Bull, 6, 1911, (108); 7, 1913, (20, 113). 
2 Pasadena, Contrih. Mt. Wilson, Solar Obs., No. 105. 
3 These Proceedings, 1, 1915, (14). 
GROWTH OF ISOLATED SPOROPHYTES OF ANTHOCEROS 
By Douglas Houghton Campbell 
DEPARTMENT OF BOTANY. LELAND STANFORD UNIVERSITY 
Communicated, June 19, 1917 
In view of the speculations concerning the possible derivation of the 
ferns from Anthoceros-like forms, it seemed worth while to determine 
how far the sporophyte is capable of an independent existence when 
separated from the supporting gametophyte. 
