80 The Transactions of the South African Philosophical Society 
The variation also has been confirmed by photographs taken at 
Anquipa, Peru, a copy of which has been kindly furnished me by Pro- 
fessor Pickering, Harvard. The Anquipa measures merely confirm the 
variation of the star; they do not confirm the nature and amplitude of 
variation, not being sufficient in number. 
A. discussion of the observations made at Lovedale during 1892, and 
portion of 1893, indicate that the variation is remarkable and worthy 
of attention. 
In obtaining the elements of variation—the periodic time and epoch 
of mean minimum—the following method was adopted: The observa- 
tions were divided into sets of 62 days, and each set was reduced 
graphically to one mean curve, the period used in reducing being 
4°425 days. 
In this way the following six mean minima dates were obtained : 
Daterot Minna: No. of Observations used Weight. 
in Reducing. 
1892. Jan. 6°80 3 4 
Mar. 8°73 12 4 
May 9:73 us 1 
July 10°68 46 if 
Nov. 11:60 16 1 
1893. Mar. 15°52 28 iL 
A preliminary examination of these dates indicates that 14 periods 
are performed in about 61:965 days. Adopting this as a probable 
value, and also taking 1893, March 15.53, as the epoch of minimum, 
then from the six dates the following six equations of condition can be 
formed : 
d 
AE —7 AP —0:025=0; weight 1. 
AE-—6 AP+0°:010=0; __,, 
AK -—5 AP+0:025=0; _,, 
AE—4 AP—0:010=0; __,, 
AE-2 AP-0:000=0; ,, 
AE-0 AP+0:010=0; _,, 
These equations are reduced from the expression : 
a eet 
d 
}(1893, March 15°53 + AE) -d} —n (61°965+ AP) =0. 
AE being correction to epoch 1893, March 15:53. 
AP, correction to period 61:965 days. 
n, number of periods of 61:965 days from epoch. 
d, date of mean minimum. 
