222 
ON THE ULTRA-VIOLET SPECTRA OE THE ELEMENTS. 
Bismuth lines. 
Approximate 
wave-length. 
Remarks. 
Approximate 
■wave-length. 
Remarks. 
3595-3 
2799-0 
3510-4 
2780-0 
3396-2 
2730-0 
3066-0 
Very strong, often reversed. 
2593-0 
3023-5 
2524-0 
3000-0 
2515-4 
2996-0 
2448-0 
2937-4 
2435-5 
2897-0 
2431-0 
2862-0 
2400-8 
Very strong. 
2810-0 
2277-0 
Weak, reversed. 
Carbon. 
In our map we give the carbon lines as developed in the arc. These occur in the 
arc taken between poles of purified graphite in air, and in nitrogen, and in carbonic acid 
gas, and they are always present in the arc taken in our crucibles. Most of them are 
also in the spark spectrum of carbon as described by us (Proc. Boy. Soc., xxxiii., 
403 ), but some of the spark lines are not developed in the arc, and there are two 
lines in the arc which we did not notice in the spark. 
Carbon lines. 
Approximate 
wave-length. 
Remarks. 
288M 
Not observed in spark. 
2528-1 
2523-9 
2518-8 
2515-8 
2514-1 
2506-6 
2478-3 
The strongest line. 
2434-8 
Not observed in spark. 
