500 
PROFESSOR W. H. HARTLEY OH THE 
1 in 10,000. 
Thickness of 
la 3 'er of liquid. 
Description of spectrum. 
Wave-lengths. 
millims. 
10 
Continuous to. 
3917 
Absorption band. 
3982 to 2747 
The absorption is weakening and rays ] 
3800 
appear feebly, thougb in reality > 
3739 
strong lines, as far as. ... J 
3682 
Rays very feebly transmitted to . 
2863 
Continuous, but weak to. 
2747 
9 
Continuous to. 
3600 
Absorption band. 
3600 to 3033 
Rays feebly continuous to. 
2653 
8 
Continuous to. 
3600 
Absorption band. 
3600 to 3033 
Rays continuous but feeble to 
2653 
7 
The description of the spectrum trans- 
mitted by 8 millims. is the same, 
with the exception of a trace of a 
line at. 
2310 
6 
Spectrum precisely the same as 7 
5 
millims. 
Spectrum precisely the same as the 
foregoing as far as. 
2653 
Apparently an absorption band . . 
2740 to 2310 
Rays feebly transmitted to ... 
2310 
4 
Precisely the same as above, but in 
addition to the rays transmitted 
weakly to. 
2310 
There are others extending to . 
2255 
3 
Continuous. 
3600 
Absorption band . 
3600 to 3033 
This band is greatly weakened, so that 
rays are faintly transmitted to. 
3033 
Continuous to. 
2740 
Absorption band. 
2740 to 2310 
Rays transmitted, the absorption being 
weakened between 2740 and- . 
2568 
Also from 2430 to. 
2255 
2 
Continuous to. 
2863 
Continuous to. 
2740 
Absorption band, diminished in inten- 
sity. 
2740 to 2310 
Rays transmitted weakly to ... 
2568 
Very feebly to. 
2255 
i 
