The motion of tlie ytarn 



107 



4) The ellipsoidal hypothesis, corresponding to the first term of the general expres- 

 sion for the frequency distribution of the velocities of the stars, gives a rather good 

 representation of the observed proper m.otions of the stars. 



5) There are, sensible deviations from the ellipsoidal hypothesis, which still must 

 be accounted for. 



6) No positive evidence is, as yet, to hand for accepting the hypothesis of two 

 star-streams as an explanation of the distribution of the observed proper motions of 

 the stars. 



