( 473  ) 
NATRIUM. 
n 
/^(Langley) 
(Rubens) 
I 
1.53529 
0.819 
0.816 
240 
.53062 
1.14 
1.13 
180 
.52961 
1.27 
1 .25 
15 
.5286 
1.44 
1.42 
5 
.5281 
1 .57 
1.54 
5 
.52711 
1.85 
1.80 
25 
.52613 
2.21 
2.16 
45 
. 52589 
2.31 
2.25 
35 
.52455 
2.90 
2.84 
20 
.5234 
3.42 
3.36 
5 
1.52178 
4.06 
4.00 
10 
RUBIDIUM. 
n 
//.(Langley) 
(Rubens) 
/ 
1.53733 
0.744 
0.742 
12 
.53624 
0.782 
0.779 
450 
.5359 
0.795 
0.792 
300 
.5332 
0.93 
0.92 
10 
.53202 
1.01 
1.00 
35 
.5309 
1.11 
1.10 
10 
..52912 
1.35 
1.33 
200 
..52830 
1.49 
1.51 
180 
. 52597 
2.28 
2.22 
20 
.52477 
2.80 
2.73 
25 
1.52186 
4.03 
3.97 
10 
KALIUM. 
n 
//(Langley) 
//.  (Rubens) 
/ 
1 .53654 
0.771 
0.768 
620 
.5325 
0.97 
0.96 
10 
.5310 
1.11 
1.10 
20 
.53030 
1.18 
1.17 
320 
.52972 
1.25 
1.24 
200 
.52823 
1.53 
1.50 
95 
.5261 
2.24 
2.18 
5 
.52486 
2.76 
2.70 
20 
.52401 
3.14 
3.08 
20 
.52263 
3.73 
3.67 
15 
1.52184 
4.04 
3.98 
10 
CAESIUM. 
n 
//(Langley) 
//  (Rubens) 
/ 
1 . 53566 
0.803 
0.801 
40 
.53451 
0.855 
0.851 
250 
.53375 
0.895 
0.891 
200 
.5333 
0.920 
0.914 
75 
.53202 
1.01 
1.00 
90 
.52902 
1.37 
1.35 
70 
..52846 
1.48 
1.45 
80 
..5275 
1.74 
1.70 
5 
.5264 
2.08 
2.03 
5 
.5257 
2.41 
2.35 
^ 5 
.52433 
3.00 
2.93 
50 
.52315 
3 .51 
3.45 
30 
1.52203 
3 97 
3.91 
10 
Verslagen  der  Afdeeling  Natuurk.  Dl.  XV.  A**.  1906/7. 
32 
