Band and Line Spectra of the same Metallic Elements. 117 
being finer and feebler, but also more widely separated with increase of wave- 
length; it has a strong line at the head, 3383. A second very strong line 
\ 3280°8 is at the head of a second band, which is scarcely represented at all when 
05 gr. of Ag is used. | 
All the lines and bands observed and recorded in this spectrum were 
measured. 
Measurements of all the lines and bands observed in the spectrum. 
Quantity of 
Silver. N Lines. 
0:5 gr. 7665°6 K, impurity line. 
6675 Very faint. 
6312 Ca, impurity. Faint band. 
146) Ca, impurity. Faint band. 
3890-3} Na, impurity. 
5806] Ca, impurity. Faint band. 
5356 Tl? Very faint. 
Diffuse bands. 
Aha} Wavy Gostate 
ead Paint band. 
a Feeble. 
18 _ Feeble. 
re Feeble. 
ai} Feeble. 
rou Feeble. 
A Very faint. 
aa Very faint. 
TRANS. ROY. DUB. SOC., VOL, IX., PART VII. U 
