Band and Line Spectra of the same Metallic Elements. 127 
TIN. 
‘The salt used was crystallized stannous chloride SnCl,* 2H,O dissolved in water. 
Description of Spectrum. 
Quantity of Tin. 
(1) 1:0 gr. in (Plate 7).—An intense banded spectrum, extending from \ 5000 
10 portions. to the end of the photograph at \ 3250. The bands are flutings 
not composed of separate lines in groups, but having sharp edges. 
Lines, none. 
(2) 0:5 gr. in The bands are strong throughout. 
5 portions. 
(3) 0°25 gr. in Strong bands throughout. 
2 portions. 
(4) 0-1 er. Bands feeble throughout. 
(5) 0:01 gr. Merest indication of bands between A 4700 and 3490. 
(GL) @ell aa, Feeble bands throughout from \ 5000 to 8250. 
(EAL, &)) 
(2), (3), (4), (5) 
0:01 gr., 
0:001 gr., 
0-001 gr., 
and 
0:0001 gr. 
Here it will be observed that spectrum has entirely disappeared when the 
quantity of tin has been reduced to less than 1 centigramme ; and that no lines 
appear, the spectrum being a banded one throughout. 
No spectrum. 
THALLIUM, 
The salt used was fused TINO, dissolved in water. 
QUantiey Of Description of Spectrum. 
(1) 0°5 gr. in No very distinct bands, but a continuous spectrum throughout, 
5 portions. in which there appear rudimentary bands and lines. 
Lines \ 5351 and 3776, very strong. 
A pair bay fairly strong. These are the heads of bands 
3019 
degraded on the less refrangible side. 
X 2 
