462 
CAPTAIN W. DE W. ABNEY ON THE SOLAR SPECTRUM. 
other lines below it do not appear to vary. Again, X /} X //5 X ///5 are unmistakably not 
due to ordinary atmospheric absorptions, nor are the pair which I have called Y. 
There are some metallic lines present which appear to be coincident with certain lines 
in the spectrum, and as I have before pointed out in the Proceedings of the Royal 
Society, these are all metals of a low melting-point. My observations have been 
confirmed recently by Henri Becquerel in an unmistakable manner, since he was, at 
the time he made his research, I believe, unaware of the paper alluded to. 
I have finally to record my thanks to Sergeant H. Jackson, R.E., and Mr. 
Walter Bradfield, my two assistants, for the care they have taken in the work, 
which has been long and arduous, extending over the best of five years to complete. 
Line. 
Measures. 
Wave-lengths. 
Check measures. 
Line. 
Measures. 
Wave lengths. 
Check measures. 
1 
20542 
7146-0 
7146-0 
45 
25016 
7234-5 
7234-7 | 
2 
20691 
7148-9 
46 
25168 
7237-5 
3 
20829 
7151-6 
47 
25203 
7238-1 
4 
20843 
7153-8 
48 
25251 
7239-1 
7239-1 
5 
21184 
7157-9 
7157-8 
49 
25397 
7241-8 
6 
21277 
7160-3 
50 
25458 
7243-0 
7 
21375 
7162-5 
51 
25503 
7243-8 
8 
21430 
7163-6 
52 
25578 
7245-4 
9 
21527 
7165-5 
7165-5 
53 
25664 
7247-1 
10 
21555 
71661 
54 
25735 
7248-9 
7248-8 
11 
21772 
7170-3 
55 
25841 
7250-6 
12 
21802 
7170-9 
56 
25874 
7250-9 
7251-0 
13 
21837 
7171-6 
57 
25906 
7251-6 
7251-8 
14 
21867 
7172-2 
58 
26091 
7255-8 
15 
21969 
7174-3 
59 
26123 
7256-4 
16 
22026 
7175-4 
7175-3 
60 
26258 
7259-1 
7259-1 
17 
22249 
7179-7 
7179-8 
61 
26320 
7260-3 
18 
22397 
7182-7 
62 
26412 
7262-2 
19 
22490 
7184-6 
63 
26457 
7263-1 
20 
22537 
7185-4 
7185-4 
64 
26509 
7264-1 
7264-1 
21 
22751 
7189-6 
7189-6 
65 
26719 
7268-3 
22 
22856 
7191-6 
66 
26877 
7271-4 
7271-6 
23 
22914 
7192-8 
67 
27000 
7274-1 
24 
22973 
7194-0 
68 
27060 
7275-3 
7275-4 
25 
23033 
7195-2 
69 
27108 
7276-2 
7276-0 
26 
23070 
7195-9 
70 
27202 
7279-2 
7279-2 
27 
23110 
7196-7 
7196-5 
71 
27357 
7281-0 
7281-0 
28 
23168 
7197-9 
72 
27492 
72S3-7 
7283-7 
29 
23207 
7198-6 
7198-7 
73 
27610 
7286-0 
30 
23247 
7199-4 
74 
27655 
7287-9 
31 
23301 
7200-2 
75 
27767 
7289-1 
7289-3 
32 
23344 
7201-3 
76 
27883 
7291-4 
7291-2 
33 
23377 
7201-9 
77 
27980 
7293-3 
34 
23409 
7202-6 
7202-4 
78 
28061 
7294-9 
35 
23510 
7204-6 
7204-7 
79 
28143 
7296-5 
36 
23552 
7205-5 
80 
28238 
7298-4 
7298-6 
37 
23668 
7207-7 
7207-9 
81 
28366 
7301-0 
38 
24019 
7214-7 
7214-7 
82 
28415 
7302-0 
39 
24379 
7221-9 
83 
28668 
7306-7 
40 
24576 
7225-8 
7225-8 
84 
28695 
7307-2 
41 
24818 
7230-6 
7230-7 
85 
28727 
7307-8 
7307-2 
42 
24853 
7231-3 
7231-3 
86 
28759 
7308-4 
7308-4 
43 
24906 
7232-3 
87 
28790 
7309-8 
44 
24935 
7233-9 
88 
28877 
7311-3 
7311-4 
