,356 
DR. W. M. HICKS: A CRITICAL STUDY OF SPECTRAL SERIES. 
AS. 
(5) 2344-4 
42642-10 
179-43 
-(3) 2354-3 
42462-67 
75-60 
-(1) 2358-5 
42387-07 
(5) 3765-463 
2654976 
181-64 
(2) 3739-88 
26731-40 
74-74 
(9) 3729-450 
26806-14 
(1) 2484-1 
40244-05 
17910 
(2) 2473-1 
40423-15 
70-39 
75-59 
(1) 2468-8 
40493-54 
(4049874) 
(22127) 
(45179-30) 
179-50 
(2204-0) 
(45358-80) 
75-60 
(2200-3) 
(45434-40) 
(2098-5) 
(47681) 
[2049-5] 
[4877674] 
[2042-2] 
[48950-34] 
[2038-8] 
[49031-94] 
The observation errors for m = 1 and 3 are very considerable, since the measures 
are only given to ’1 A.U. and '05 A. produces about dn = ‘8. Consequently it is 
possible only to obtain approximate values for On the other hand, for m = 2, 
where we have very accurate measures, there must be some doubt about the allocation 
of 83(2) because its intensity, 9, is so excessive in comparison with the 5, 2 of Sj 
and Sg, and the separation of 181’64 is greater than observation errors on the lines 
for m = 1, 3 allow. The latter objection, however, can be set aside as it corresponds 
to the excess observed in Kr and X diffuse sets and, as will be found later, in NeS. 
In these cases 1^1 +1/3 comes out to be normal. Here, however, the sum is about 
1’35± too large, and with the S(l) separations the typical 83(2) would be at 
2680479 or = T8, probably of intensity 1, and so overshadowed by the strong 
line in the list. As will be seen immediately, the linkages will show that this value 
is preferable. The linkages will also show the probability of a line at 40498 for 
83(3). 
The three fii’st 81 lines give the formula 
n = 51731‘05-Nyjm + -095901- - 
For the determination of Ai, A2, the oun and the links, reliable values of vi and 
are required. We have seen that the values obtained from the observed sets of lines 
are subject to large observational errors. Nevertheless that the true value of Pi is 
