428 
DR. W. M. HICKS: A CRITICAL STUDY OF SPECTRAL SERIES. 
No. (2) is close to ( —2(5i) 25107 or {S^) Fj. It should be noted that the C.R. copper 
line is a ( —(^i) displacement on that observed by Watson, and that the latter was 
only observed after the emanation had been standing two days. No. 3 gives the 
calculated values. 
m = 5. 
Outside 
(1) 2n26-0(W.).M 
23948 (C.R.).w 
(1) 26669-23 
5648-6+ du 
32317-8 2822+ 6p 
35139 + Qp 
(2) 18641-4 {W.).v 
(6) 21458-86 (W.).r, (6-56) (R.R.) 
26669-23 
5652-8+ dv 
32322-0 2817-4 
35139-46 
u.{l) 19842-4 (W.).e 
m.( 4) 22636 (C.R.).e 
26669-23 
5659-7 + de- 
du 32328-9 2793-6+ 6p 
35122-5 
These would seem to show in Nos. 2, 3 sequence displacements ; 2S would here 
produce a change of 4. In (2) it is displaced in the second and continued in the 
third. In (3) it is displaced only in the second. 21126 acts as a sounded line for 
F3(4) and Both cannot be real or the line is double. 
m — 6 . 
{(2) 27566-36 
2. I 
I 27566-36 
(1 ) 22015 (C.R.).m 
5640-4 + 6p + du 33206-8 + 6^? 
(3) 19527-8 {W.).v 
5642+ dv 33208-4 
There is a C.R. copper line (2) 16386 + 3 which with the u link gives 27577 ±3 and 
may be ( —(^i) F(6). 
The two last observed lines have been included in order to show that sounding is 
justified l)y them. The calculated line for m = 7 is 281557, with error probably 
within 3 or 4 units. There is 16982 (C.R.) which with u sounder gives 28173’8±3 
and may well correspond to Fj (7). Also 22636 (C.R.).'n gives 33827‘8 which is 
5654 ahead and may be (S^) Fa (7). But this line with an e—u link also gives Fg (6). 
It should be noticed how the lines observed by Cameeon and Ramsay with copper 
electrodes come in to fill parallel and displaced lines where they seem called for. 
The corresponding F lines for the orders above the observed ones are in the ultra¬ 
violet, but evidence for their existence is given by sounding. In what follows, the 
value of Fj calculated from Fj is enclosed in square brackets. 
m = 2. [44082‘4±2.] 
^ / (.^i) (6) 21712-09 (R.).2i^ (3(5i) (0) 27389-61 (R.).2w 
9’6 49731-3 + 2d^4 
(8) 25170-10 (W.).2r ? 
8445 = 5645 + 2814-13-96 52531-3 + 2dy 
440817+ 2dw 
(3) 16725-1 (W.).2v 
44086-3+ 2dv 
