EEV. T. E. EOBmSON ON SPECTEA OE ELECTEIC LIGHT. 
965 
Table XIII. — Tin. 
I have given the transition spectrum for air. In it No. 7 is the beginning of light. 
No. 10 is the beginning of a band almost entirely dark, which occupies the place of 
Another dark interval at No. 19 seems to replace the bright group and a third at 
No. 22 stands for ri. No. 25, which, though very faint, is the brightest among them, is 
the residue of d. The lines at the violet end are relatively less faded, but are all very 
obscure. 
6 Q 2 
