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ON FLAME SPECTRA AT HIGH TEMPERATURES. 
Description of Plates. 
PliotogTaphs of spectra of the oxy-hjclrogen flame, and of various salts, oxides, 
and metals, heated in the same for a uniform period of one hour. Dispersion 
used equal to one quartz prism of 60^, Enlarged about two diameters. 
PLATE 6. 
1. Oxy-hydrogen flame, water vapour lines. 
2. Lithium nitrate, lines of lithium and sodium. 
3. Sodium chloride 
4. Potassium nitrate 
5. Ma gnesiurn nitrate 
0. Calcium sulphate 
7. Strontium sulphate 
8. Barium chloride 
9. Iron 
10. Nickel oxide 
11. Cobalt oxide 
12. Manganic oxide 
1 3. Chromium sesqui-oxide 
Band spectra ol oxides and chlorides, 
with line spectra of metals. 
I 
Line spectra of the metals chiefly. 
PLATE 7. 
Band spectra of arsenic, antimony, bismuth, lead, and silver, with a dispersion of 
four quartz prisms of 60°. Enlarged about two diameters. 
