STUDIES ON THE VARIABLES OF THE ALGOL-TYPE. 



35 



mean maximum brightness and the mean range of variation 

 respectively. 



TABLE VII, 



The examination of the above table shows that the rate of 

 increase greatly accelerated in the last ten years and at the same 

 time, the maximum or normal brightness in its mean value 

 became fainter. Although it is not very significant, the period 

 became longer with the time, or at least, in recent years a few 

 Algols exhibiting comparatively long period have been discovered. 

 Possibly, in the future, we may be able to discover Algols whose 

 range of variation lie less than a half magnitude, but at present, 



