58 



Sven Wickseil 



support of the value 0.75. The definite bearing of our figures on the two-stream 

 hypothesis is not to be asserted before we have computed the mean errors in the 

 characteristics. We shall come back to the question in § 30. 



25. By the discussions of this chapter it has been made probable that the 

 constant q has a value about 0.75 The evidence in favour of this value is: The 

 vertices constitute a galactic system as has been found from the radial velocities; 

 the transgalactic axis has the same value as deduced from the radial velocities; 

 the coefficients of the skewness and the excess are small; the skewness and excess 

 of the motions as projected on the principal axis of polarity is the same as found 

 when using the results of Eddington for the two-stream hypothesis. Accordingly we will 

 adopt q' = 0.75 for the linear motions of the stars and give the characteristics for 

 this value of q. Before this, however, we will assert the effect of a variation of 

 the mean parallax & 1 with galactic latitude. In this connection we will also work 

 out the methods to derive the mean errors of the characteristics. 



