118 
Quantity of 
Silver. A 
: ; 4305) 
0'5 gr. 4303} 
4226°9 
4047 
4043 
3857 
3772 
3741 
3733 
3716 
3406° 
3401 
3398 
3395 
3395 
3383 
5807 
3332 
53308 
3280°8 
Remarks.—TVhe series of diffuse bands lying between \ 4700 and \ 4300 is well 
The very strong line common to the are and spark, 
\ 3383°0, is shown to be preceded by a strong composite band, the components 
of which are lines, or very narrow bands, but so far they have been resolved into 
This composite band is extinct with 0:1 gr. of silver 
seen with 0°5 gr. of silver. 
merely very fine lines. 
Hartitey—An Lnvestigation of the Connexion between 
Diffuse bands. 
Very faint. 
A strong line. 
Feeble line. ) 
Ca, impurity. 
Strong line. } A pair. K, impurity. 
Very faint. 
Strong. Tl.? 
Very faint. 
Very faint. 
Fairly strong. 
Faint. 
Faint. 
A strong composite band. Faint. 
Faint. 
Faint. 
Very strong line. 
Very faint line. 
Faint. 
Faint. 
A very strong line. 
in the flame, but the diffuse bands still remain faintly visible. 
Quantity of 
Stlver. 
O-l gr. 
0:01 gr. 
0-001 gr. 
0:0001 gr. 
0:00001 gr. 
No bands. 
Silver yields no banded spectrum unless there is more than 1 centigram of 
metal in the flame; and no spectrum at all unless there is more than +1, of a 
milligram present. 
Description of Spectrum. 
The bands between waye-lengths 4700 and 4290 are well seen. 
Lines are broad and strong at wave-lengths 3383 and 3280°8. 
The above lines are alone visible. 
The same lines are shown decreasing in strength. 
The same lines are shown weak. 
Nothing visible. 
