STUDIES ON THE VAKIABLES OF THE ALGOL-TYPE. 25 



we can assume that the Algols partake of the common properties 

 of the ordinary stars. This problem was taken up by Prof, 

 Pickering and be found the pole of the circle for which the 

 Algols tends to agglomerate. Although I could not see the 

 original paper, I saw his determination in Gierke's " System of 

 Stars " and it is 



A = 195° 

 D= 20° 



This pole somewhat deviates from the pole of the milky way and 

 naturally a question will be raised whether the plane of condensa- 

 tion differs from the galaxy, or the result is only an apparent 

 phenomenon produced from the insufficient material. In fact, 

 Prof. Pickering had very few Algols to dispense with. Thus, 

 if we can suppose that those few Algols were not found uniformly 

 over the entire sky and thus the insufficient material may pro- 

 duce a great error, it would be very important to work on the 

 increased material. With this idea, I took the problem to 

 determine the pole from 93 Algols, enlisted above. 



According to the method by Newcomb, used in his " On 

 the Position of the Galactic and other Principal Planes toward 

 which the Stars tend to crowd," a, b, c, are the rectangular co- 

 ordinates of any one of the given stars, referred to the axes 

 passing through the pole, the equinox of 1900.0 and the point 

 on the equator in 90° of the right ascension : namely, we have 



a = C0S o cos a 



b = cos sin a 

 c=sin 0. 



If we put X, Y, Z the direction-cosines of the required pole 



