Lxronarp—On the Quantitative Spectra of Molybdenum, &¢. 275 
QUANTITATIVE Spectrum oF Sopium TunesratE—continued. 
iierours- | (Wate: | ana Pere | Messe | Wave | ‘ana Per 
ment. sistency. ment. sistency. 
540°15 2679-8 4x 562°47 2608°5 1x 
~-——22 563°47 2603-1 4x 
545°07 2664:4 4 —-24-——_ 
546°86 2658°1 3% 570°77 2581°2 46 
547°23 2656°6 2x 573°39 2572°3 4p 
547°87 2653°6 3x 576°15 2563°2 4y 
550-21 2647°8 4x 578°77 2555°1 4 
——-2,3-——_ 580-03 2651°5 30 
55430 2632°9 2 —-25-——_ 
598-19 2620°2 46 586-93 2531-1 3x 
560°24 2615-5 4x 590°13 2522°1 4o 
THORIUM. 
Thorium nitrate was employed for these solutions. 
This 
element gives a well-defined spectrum in strong solutions; but 
the lines are rapidly extinguished on dilution. 
Two of the last 
lines to disappear, AX 4391-3 and 4382°1, are situated in the visible 
rays between gold lines 10 and 11. 
A number of lines were 
measured between gold 18 and 20 which could not at first be 
identified, but were afterwards found recorded in the arc-spectrum 
of Exner and Haschek. 
QUANTITATIVE SPECTRUM 
oF THortum NITRATE. 
Measure | Wave: | snaper | Measure | Ware | and Per 
ment. sistency. ment. sistency. 
——9-10—_ 322°91 4116-9 ax 
303°30 4391°3 8 wv —-12———_ 
303°80 4382-1 8 wy 330°80 4019°3 10 x 
——11—_ ——_13-——_ 
