Band and Line Spectra of the same Metallic Elements. 101 
Description of Spectrum. 
PRoportions oF Strontium IN SoLurion. 
2°0 per cent. 1:0 per cent. 0-1 per cent. 0-01 per cent. 0:001 per cent. 
6747 ce 6747 
6627 se Band diffuse. 
6497 oe 6497 6497 6497 
6364 * Band. 
6243 Band. ae 6243 a line. 
6053 x Band. 
6031 oe 6031 afineline. 6031 6031 
5541 * A band; the com- 
Band composed} 5524 is ponent lines are 
of fine lines) 2004 B not distinguish- 
in the green. | 9480 % able. 
5448 
2 per cent. 1 per cent. 0-1 per cent. 0°01 per cent. 0:001 per cent. 
Band composed of { 5255 — — 
three lines. 5239 — — 
5225 — — A band extending to the 
4964 — — | last group, the com- 
4607 — — ponents of which are not 
4215 — —- | distinguishable. 4670 
4077 _ -~ : 
BARIUM. 
Oxyhydrogen Flame Spectrum. 
Re-crystallised barium chloride was dissolved in the proportion of 4°884 grs. 
of BaCl,2H,O0 in 100 e.c. of water. This contained 2°74 gers. of barium. 
Photographed with Wratten and Wainwright’s panchromatic plates. 
Weight of Description of Spectrum Photographed. 
0:0996 Fluted bands extending intermittingly from A 5380 to A 4080, 
gt und strong lines about \\ 5274, 5180, and 4900-1. 
There is also a strong line at \ 5536. 
Fluted bands from » 5780 to d 4080, with strong lines \d 5274, 
0°0822 gr. 5180, and 4900. A strong line at \ 5536. 
TRANS. ROY. DUB. SOC., VOL. IX., PART VII. S 
