158 Transactions of the Boyal Society of South Africa. 
ceeded in explaining this " tail in terms of two fundamentals lying close 
to those of the head. 
" Tail " of A line — 
V silue 
of 71. 
First Members of Pairs. 
Value 
of n . 
Second Members 
of Pairs. 
Frequency 
Calculated from 
13167-1 -0-1845('« + 16)2. 
Error. 
Frequency 
Calculated from 
13164-6-01833(w+15)2. 
Error. 
1 
13113-8 

+ 0-1 
1 
13117 7 
1 A.-| 
+ 0-1 
2 
13107-3 
- 0-1 
2 
13111-6 
+ 0-1 
3 
13100-5 
- 0-3? 
3 
13105-2 
+ 0-1 
4 
13093-3 
- 0-2? 
4 
13098-4 
+ 01 
5 
13085-75 
- 0-25 ? 
5 
13091-3 
+ 0-1 
6 
13077-8 
- 0-2? 
6 
13083-7 
0 
7 
13069-5 
- 0-2? 
7 
13075-9 
0 
8 
13060-8 
- 01? 
8 
13067-6 
0 
9 
13051-8 
- 0-1 
9 
13059-0 
0 
10 
13042-4 
0 
10 
13050-0 
0 
11 
13032-6 
0 
11 
13040-7 
0 
12 
13022-5 
0 
12 
13031-0 
+ 0-1 
13 
13011-95 
0 
13 
13020-9 
+ 0-1 
14 
13001-05 
0 
14 
13010-4 
- 0-1? 
15 
12989-8 
+ 0-1? 
15 
12999-6 
- 0-1? 
16 
12978-2 
0-1 ? 
16 
12988-4 
- 0-1? 
12966-4 
+ 0-1 ? 
17 
12976-8 
- 0-1? 
By these formulae the whole of the observed lines in the A complex 
are accounted for, except one isolated line at 13124-6, which is possibly 
not a true oxygen line. 
The B complex is a very close imitation of A, and consequently the 
formulae required only differ as regards the constants. 
Head of B. — The more accurate formulae are — 
\ 14555-5 ) 
( 14557-7 i 
0-2671- + 0-llw, 
which give all the lines with a maximum error of + 0*15; but the simpler 
formula given in the following table is almost as accurate, and is strictly 
analogous to that of the A line : — 
Value 
of 11. 
Frequency 
Calculated from 
145557- in-. 
Error 
Compared 
with 0bser\ed 
Values. 
Value 
of 11. 
Frequency 
Calculated from 
14557-7 
Error 
Compared 
with Observed 
Values. 
1 
14555-5 
0 
1 
14557-5 
0 
2 
14554-7 
0 
2 
14556-7 
- 0-1 
3 
14553-5 
0 
3 
14555-5 
0 
4 
14551-7 
0 
4 
14553-7 
- 0-3? 
5 
14549-5 
- 0-1 
5 
14551-5 
- 0-2 
6 
14546-7 
- 0-2 
6 
14548-7 
- 0-2 
7 
14543-5 
- 0-1 
7 
14545-5 
- 0-1 
8 
14539-7 
- 0-1 
8 
14541-7 
- 0-1 
9 
14535-5 
0 
9 
14537-5 
+ 0-1 
10 
14530-7 
+ 0-1 
10 
14532-7 
+ 0-2 
