DR. W. M. HICKS: A CRITICAL STUDY OF SPECTRAL SERIES. 
361 
Kiypton. The following table contains lines allocated to the D series for krypton 
and discussed in the present communication :— 
KrD. 
//( = u 
m 
■in 
■m 
= 
I 
I 
I 
m = o 
m 
= 6 { 
m = i 
Dis 
Di7 
Djfi 
Di.5 
Di4 
Di3 
Di2 
Dn 
Di8 
Dir 
Di5 
Di3 
Dn 
Di5 
Dn 
(1) 19116-44 
1860-19 
(1) 19928-46 
1048-17 
(21 20669-36 
307-27 
[20763-25] 
213-38 
(2«) 20842-89 
133-74 
(1) 20871-60 
105-03 
(<1) 20875-78 
100-85 
(6)20976-63 
(1) 38037-85 
[38275-82“ 
'38324-67 
(Im) 38497-23 
(1) 38531-94 
(5) 38560-46 
(2) 44408-53 
(3) 44426-67 
(47077-38) 
(47080-55) 
(48500-71) 
(49345-98) 
[49349-39] 
(49896-60) 
788 
25 
(2) 
19904 
69 
309 
71 ] 
> (2) 
20213 
86 
790 
47 
(1) 
19906 
91 
306 
95 , 
786 
03 
(1) 
20714 
49 
311 
84 ] 
> (2) 
21026 
33 
789 
67 
(3/1) 
20718 
13 
308 
20 , 
788 
40 
(-5) 
21457 
76 
308 
82 
m 
21766 
58 
OO 
40 
(2) 
21552 
65 
306 
33 
(2) 
21858 
98 
788 
78 
(1) 
21631 
67 
307 
68 
(t) 
21939 
35 
OO 
OO 
75 
(-5) 
21660 
35 
788 
28 
(2) 
21664 
06 
787 
60 
(1) 
38825 
45 
311 
96 
(2) 
39137 
41 
787 
44 
(2) 
39063 
26 
% 
787 
33 
(2) 
39112 
00 
308 
99 
(0 
39420 
99 
787 
16 
(1) 
39284 
39 
306 
87 
(2) 
39591 
26 
787-99 (2) 45196-5: 
786-19 
786 - 88 
787 - 97 
(47863-57) 
(49287-59) 
(50133-95) 
308-07 
308 - 15 
305 
309 - 89 
(45504-59) 
(48171-72) 
[49593-55] 
(50443-84) 
It will be clearer to consider first the iJu lines by themselves, and then the satellite 
lines in each order. From the first three lines the calculated formula is 
■)i 
= 5I655‘56-Ny^jm +‘897262- 
The limit is within errors of the value found for S(oo), but in view of what 
happens in the cases of X, and RaEin to be considered later, it may be noted that 
the difference = 4'27 is very close to a —8^ displacement in Sj (oo ), which 
would produce a separation of 4'42. \_Note .—If D (c» ) = S { oo ^ here s -4'27 + ^ 
3 D 2 
