76 Proceedings of Royal Society of Edinburgh. [sess. 
1 day 20 hours 30 minutes. During the remaining 4 hours 30 
minutes the star is variable in magnitude. 
During 2 hours and 1 5 minutes — half the total time of variation 
— it is decreasing in magnitude. 
During the remaining 2 hours and 15 minutes the star is 
increasing in brightness. There is evidently no stationary period 
at the minimum phase. 
Midway in the stationary maximum phase there is an apparent 
drop of 0T0 magnitude. 
This is indicated by the two observations — 
h. m. M. 
1901. July 1, 17 0 10*15. 
18 0 10*15. 
Thus we have two minimum phases — one well defined, lasting 4 
hours 30 minutes, and the other not so clearly defined. In the 
first or principal minimum the star diminishes 
M. 
0-85 
in brightness ; in the latter or secondary minimum only 
M. 
0 - 10 . 
The whole course of the light curve is set forth in fig. (1), PL I. 
The light curve of the star during principal minimum phase is given 
in fig. (2), PL II. 
