OBTAINED AT THE TOTAL SOLAR ECLIPSES OF 1900, 1901 AND 1905. 
447 
PrcBsodymium. 
Some strong spark lines appear to be shown, but an equal number not. 
Neodymium. 
There seem to be a large number of lines which can be identified with this element. 
Few of them are very strong, and there is frequently doubt about the identifications. 
The following lines are, however, probably due to neodymium :— 
Chromosphere. 
Wave-length. 
Sun. 
Spark. 
Wave-length. 
No. of photos. 
Intensity. 
3906-03 
2 
0 
3906-04 
Nd -3 
4 
3911-29 
2 
0 
3911-32 
Nd 0 
7 
3994-87 
3 
2 
3994-83 
Nd 2 
5 
4061-28 
5 
1 
4061-24 
Nd 3 
10 
4109-61 
6 
4 
4109-61 
Nd? 1 
8 
Samarium. 
Possibly some of the strongest spark lines are shown. 
Gadolinium. 
There is a strong line at 3768'46 in the chromosphere which has been attributed 
with some hesitation to the strongest line in the spectrum of gadolinium. 
Chromosphere. 
Wave-length. 
Sun. 
Arc. 
Spark. 
Wave-length. 
No. of photos. 
Intensity. 
3768-46 
6 
3 
3768-54 
Gd ? 0 
20 
20 
Several of the strong lines are possibly shown, but two of intensity 12 at 3422 and 
3719 are missing. 
Ytterbium. 
The very strong spark line at 3694’35 is shown. The next strongest spark line is 
also seen. 
Chromosphere. 
Wave-length. 
Sun. 
Spark. 
Arc. 
Wave-length. 
No. of photos. 
Intensity. 
3479-02 
1 
0 
3479-05 
000 
20 
3694-29 
8 
4 
3694-34 
Yb 3 
200 
10 
