PHYSICS: NICHOLS AND HOWES 
449 
If these remarkable relations are fundamental rather than fortuitous 
they should be found to exist where the spectra are resolved into their 
polarized components: i.e., the absorption spectrum of each compo- 
nent should consist only of series corresponding to the several fluorescence 
series of that component and each series of the fluorescence spectrum 
should have its related series of absorption bands. The rigorous test 
is difficult because of the incomplete separation of the components in 
most crystals. That the relation holds however with sHght discrepan- 
cies, obviously ascribable to the necessarily imperfect conditions as 
regards polarization, will be seen from figure 4. 
GREEN 
ITiOO . 
1 1 
+ 20° 
. I8l00 .in. 19100 .... 20100 . 
II 1 1 1 1 1 1 1 1 
■ — - — 
. 21100 . . , 
M M M M 1 1 1 
II III 111 1 
GREEN . 
. . . 22100 . 
1 1 
, . . 23100 .... 24100 . . . 
1 1 1 1 1 1 
25100 .... 26100 . . 
1 1 
II MM 
II i IIIII II 
1 II 1 1 
WHITE 
1 1 
GREEN 
Mil 
. 17100 I . . 
II 
IIIII 1 
— 185° 
. ISiOO .... ISlOO . . . 20100 . 
II 1 III 11 1 III 1 1 111^ 
1 1 1 
. . . 21100 . . 
WHITE 
1 II 
II 1 Mil 1 1 nil II 1 III! 
Ill III 1 II 
1 IIIII 
GREEN • 
. 2tl00 . . . 
1 22100 .... 23100 ... 1 24100 . 
. . . 25100 . • 
Ill nil 
II II II 1 II 1 1 1 
1 
WHITE 
II iiiii 
II 1 II 11 1 1 1 
AMMONIUM URANYL CHLORIDE . 
1 
FIG. 5 
In this diagram the reversing region, together 
with two groups of 
fluorescence bands, to the left, and of absorption bands to the right, is 
shown for the green and white components of the spectrum. The 
location of fluorescence bands is indicated by solid vertical lines above 
the base line, absorption by lines below. Fluorescence is designated 
by hg, Cg, dg, eg, Gg foY thc green component and bw, Cw, dw, ew, aw for the 
white component. The absorption series related to the above are 
marked ^g, jg, 5g, eg, ag, and ^w, jw, respectively. 
It will be noted that each series of the green component has its 
properly related absorption series and that no other absorption bands 
occur; also that bg, which is absent or too weak to be observed, is not 
represented by a related absorption series. The same is true of the 
