84 
Proceedings of Royal Society of Edinburgh. [f 
Date. 
Obser. 
Observed Light 
Curve. 
Theoretical Light 
Curve. 
Observed 
Theoreti- 
cal Curve. 
Mag. 
Res. 
Mag. 
Res. 
1901. h. 
m. 
M. 
M. 
M. 
M. 
M. 
M. 
July 2 13 
48 
10*05 
10*05 
+ 0*00 
10-05 
+ 0*00 
+ o-oo 
14 
50 
10*25 
*26 
- -oi 
•26 
- 
*01 
+ 
•oo 
15 
5 
10*35 
*37 
- *02 
•36 
- 
•01 
- 
•01 
15 
5 
10*40 
*37 
+ *03 
•36 
- 
*04 
- 
•01 
15 
12 
10*45 
*43 
+ *02 
•43 
+ 
•02 
+ 
•oo 
15 
15 
10-40 
*45 
- *05 
•45 
- 
*05 
+ 
•oo 
15 
20 
10*55 
*50 
+ *05 
*49 
+ 
•06 
- 
•01 
15 
25 
10*60 
*54 
+ *06 , 
*53 
+ 
*07 
- 
*01 
15 
35 
10*60 
*64 
- *04 
*63 
- 
*03 
- 
•01 
15 
35 
10*75 
*64 
+ *11 
*63 
+ 
•12 
- 
•01 
15 
40 
10*60 
*67 
- *07 
•67 
- 
•07 
+ 
•oo 
15 
50 
10-70 
*77 
- *07 
*77 
+ 
•07 
4 . 
•oo 
15 
50 
10*85 
•77 
+ *08 
•77 
+ 
•08 
4 . 
•oo 
15 
55 
10*75 
*81 
- *06 
*81 
- 
*06 
+ 
•oo 
16 
0 
10*85 
•84 
+ -01 
•85 
+ 
*00 
+ 
•01 
16 
5 
10*75 
•88 
- *13 
•88 
- 
•13 
+ 
•oo 
16 
15 
10*95 
•92 
+ *03 
*91 
+ 
•04 
- 
•01 
16 
30 
10*90 
*88 
+ *02 
*87 
+. 
•03 
- 
•01 
16 
30 
10*85 
•88 
- *03 
*87 
- 
•02 
- 
*01 
16 
45 
10*80 
•77 
+ 0*03 
*76 
+ 0*04 
- 
•01 
16 
48 
(10-95) 
•73 
(+*022) 
•72 
( + 0*23) 
- 
•01 
17 
0 
10*6 
*62 
+ 0*03 
•61 
+ 0-04 
- 
•oi 
17 
0 
10*05 
•62 
- *02 
*61 
- 
•01 
- 
•01 
17 
15 
10*40 
•48 
-0*03 
•48 
0*03 
+ 
•oo 
17 
15 
(10*68) 
•48 
( + 0*20) 
*48 
( + 0*20) 
+ 
•oo 
17 
30 
(10*30) 
•35 
-0*05 
•35 
0*05 
+ 
•oo 
17 
45 
10*25 
•24 
+ *01 
•24 
+ 
*01 
+ 
•oo 
18 
0 
10*15 
•16 
- *01 
*15 
- 
•oo 
- 
•oi 
18 
15 
10*15 
•10 
+ *05 
*09 
+ 
•06 
- 
•01 
19 
30 
10*05 
10*05 
+ 0*00 
10*05 
+ 0-00 
+ 0-00 
M. 
Mean residual (observed curve) =0*040 
Mean residual (theoretical curve) = 0*041 
The two observations of July 2, 16 h. 48 m., and July 2, 
17 h. 15 m., were made when the star was too low down for accu- 
rate observations to be made. 
It would be, of course, entirely unnecessary to differentiate the 
equations which relate light changes to orbital movement, and so 
form equations of condition with the values given in column (7). 
The data are too meagre for any such refinement. 
Indeed, it is evident that the accordance between theory and 
observation is so complete as to yield not only strong testimony 
to the certitude, validity, and sufficiency of the conclusions come 
to, but to render any differential correction unnecessary. 
(. Issued separately March 31, 1902.) 
