254 
DR. T. R. MERTON AND PROF. J. W. NICHOLSON ON 
the experimental conditions necessary to produce the effect cannot be as yet 
predicted. 
Helium under Three Conditions. 
A. 
h^ (ord.). 
\ (bulb). 
h K (cond.). 
Photographic intensities. 
Ratios of absolute central 
intensities. 
Ord. 
Bulb. 
Cond. 
Bulb/ord. 
Cond./ord. 
Cond./bulb. 
7065 
7-6 
8-13 
6678 
14-4 
10-2 
10-9 
61-5 
18-5 
20-6 
0-301 
0-335 
1-11 
5876 
16-5 
14-8 
16-5 
177-8 
104-2 
152-8 
0-586 
0-859 
1-47 
5047 
2-9 
— 
— 
2-75 
— 
— 
— 
— 
— 
5015 
11-5 
7-7 
8-7 
55-2 
14-7 
19-1 
0-266 
0-346 
1-30 
4922 
7-9 
9-0 
7-8 
17-1 
25-4 
15-2 
1 • 485 
0-889 
0-598 
4713 
10-9 
9-8 
9-5 
63-1 
41-5 
33-3 
0-659 
0-528 
0-802 
4472 
14-8 
16-0 
15-5 
442-6 
726-2 
489-8 
1-64 
1-107 
0-675 
4388 
5-5 
7-2 
7-0 
10-5 
21-75 
18-3 
2-07 
1-74 
0-840 
4144 
DO 
2 * 2 
1-5 
1-62 
2-88 
2-01 
1-78 
1-24 
0-687 
4121 
3-2 
3-0 
4-0 
4-72 
4-29 
6-58 
0-909 
1-39 
1-53 
4026 
5-8 
6-1 
6-5 
20-0 
23-3 
26-0 
1-165 
1-30 
1-11 
3965 
2-9 
3-1 
3-4 
4-75 
5-28 
5-89 
1-11 
1-23 
1-12 
3888 
6'6 
5-2 
7-4 
39-8 
18-2 
55-1 
0-457 
1-38 
3-03 
Another interesting feature of this table is the evidence that the Principal series 
both of Helium (A3888) and of Parhelium (AA5015 and 3965), are relatively-enhanced 
with the condensed discharge as compared with the bulb. 
(VIII.) Transfer of Energy in the Hydrogen Spectrum. 
The effects already described in connection with Helium are not peculiar to this 
gas. Experiments have been conducted in the same manner with Hydrogen, and 
with a mixture of Neon and Hydrogen. The results obtained from one of the typical 
experiments with this mixture may be given here, in so far as the Hydrogen spectrum 
is in question. 
The lines H a , H,,, H Y , H 5 , are concerned, and the magnification of the wedge 
photographs is larger, being in this case such that the enlarged length of the wedge 
is 42 mm. 
Hydrogen (with Neon). 
A. 
7q (ord.). 
h x (bulb). 
da /h 
(ord.). 
DA/H 
(bulb). 
Photo¬ 
graphic 
intensity 
(ord.). 
Photo¬ 
graphic 
intensity 
(bulb). 
Central 
intensity 
ratio 
(bulb/ord.). 
H a 
4-15 
15-6 
14-7 
1-541 
1-453 
34-8 
28-4 
0-816 
H, 
5-2 
13-8 
14-1 
1-709 
1-746 
51-1 
55-7 
1-090 
H y 
6-25 
11-5 
12-6 
1-711 
1-875 
51-4 
75-0 
1-459 
7-0 
5-3 
6-8 
0-883 
1-133 
7-64 
13-6 
1-780 
