EEV. T. E. EOBINSON ON SPECTEA OF ELECTEIO LIGHT. 
953 
In the air C.P. and E. were observed with Duboscq and are therefore comparable 
with the aluminium air spectra. So also were those of Hg, P, and S^C, In the mer- 
curial vapour the discharge was bright, greenish white, with very large cloudy strata ; 
the spark discharge without the jar gave exactly the same spectrum. It has more *s 
than oxygen or carb. oxide ; but the rest of it is very dark. In the phosphorus and 
bisulphuret the tubes were so darkened by deposit as to make observation difficult; 
the first was red, I suppose allotropic P, for nothing would remove it but strong nitric 
acid ; the other is partly black (I suppose sulphuret of Hg), partly grey arranged in 
striae (perhaps carbon). The P spectrum is so like that of Hg vapour, that I think it 
exerted very little influence, and in the other the metallic vapour seems also to predo- 
minate. I also tried olive oil in the same apparatus to ascertain whether its vapour 
(which may be present in air-pump experiments) could produce any effect. The flash 
of the discharge was bright green, as in the CO and S^C tubes ; but this probably came 
from the decomposition of a film of oil on the electrodes : the spectrum was identical 
with Hg vapour, except that it was very faint. 
Table III. — Silver. 
Air. 
Nitrogen. 
Oxygen. 
Hydrogen. 
Carb, oxide. 
Spark C.P. 
J. C.P. 
C.P. 
R. 
C.P. 
E. 
C.P. 
E. 
C.P. 
E. 
C.P. 
E. 
1. 
O 
32 
37-4 vf. 
36-5* 
36-5 0. 
37 * 
double. 
double. 
2. 
38-8 » 
38-5* 
double. 
3. 
40 b. 
40-8* 
41 0. 
40 * 
41 f. 
39-5 0. 
40 5 # 
4. 
42 5 f. 
41-5 f. 
5. 
46 f. 
45-5 f. 
6. 
49 b. 
47-8 b. 
49 f. 
48 * 
49-5 b. 
7. 
51-4 b. 
51-5 f. 
51-5 
51 f. 
50-5 f. 
51-5 c. 
52 *wi-s 
8- 
y 
56 * 
55-8 » 
55 * 
56 f. 
55 c. 
56-5 f. 
56 f. 
9. 
32 
58 
59 f. 
59 f. 
58-5 f. 
57 5^^ 
10 
33 
0-5 f. 
0 f. 
11. 
43 » 
4 c. 
3-8 c. 
3 c. 
3 5f. 
3 c. 
3 f. 
3 f. 
12. 
1 
5 » 
4-8# 
4 ^ 
5-5 b. 
4 f. 
13. 
6-7 vf. 
6 f. 
6-5 * 
65 * 
7 
7 1 
f. 
7 * 
14. 
c 
87 b. 
9 b. 
8-8 b. 
8 
8 f. 
three 
15. 
f' 
11 c. 
10-8 1 b. 
10 b. 
11 b. 
95 
f. 
16. 
l" 
not taken. 
12 # 
ll-3;b. 
12 j b. 
12 5 c. 
close pair 
three 
r 
17. 
14 b. 
13-8 c. 
14 b. 
13 J b. 
13 c. 
13 f. 
14-5 
f. 
18. 
18 f. 
17-8 b. 
1 
15-5 1 c. 
17-5 Ic. 
17 b. 
17 * 
18-5 f. 
three 
16 f. 
19. 
20 7 b. 
19 J c. 
19-5 J 
f. 
20. 
22 b. 
22-8 c. 
23 vnc. 
21 f. 
22 1 
22-5 
21-5 1 c. 
21-5 f. 
21. 
« 
24 
24-8* 
23-5* 
24 » 
24-5 1 
24 * 
23 f. 
23-5 
24-5 / c. 
22. 
25 * 
26 J 
261* 
25 * 
23. 
30 8nb. 
29 
30-8 c. 
29-5 f. 
32 nc. 
30 
30 f. 
29 b. 
31-5 f. 
30/ 
30 f. 
24. 
33 5 » 
33 5* 
33'8 * 
34-5* 
35 f. 
33-5 b. 1 
32 1 b. r 
34 lb. t 
32-4 I b. 
34-5 r b. 
35 f. 
25. 
37 f. 1 
35 c. 1 
37 c. j 
36-8 f. 
38 b. 
39 b. 
37 b. ^ 
38 J b. 
37-5 f. 
36 f. 
26. 
41 4 
41 
40-8 f. 
41 c. 
40 5 f. 
41 5 f. 
41 * 
40 b. 
39 * 
40 * 
40 f. 
27. 
44-8 1 b. 
42-5* 
43 b. 
44-5 f. 
44 b. 
42 f. 
42-5 b. 
44 f. 
28. 
46 b. 
47 c. 
46-8 / b. 
46 1 b. 
46 f. 
29. 
47-5 ; b. 
48 c. 
30. 
50 7 b. 
49 * 
50-8 c. 
51 
50 f. 
51 
50 * 
50 b. 
50-5 
double. 
31. 
< 
52 ] b. 
52-5 f. 
52 5 c. 
52 f. 
52-5* 
53 f. 
32. 
54 b. 
54-5 J b. 
55 
55 * 
53-5 b. 
54'5 c. 
