The bands of magnesia are remarkably distinct and strong, lying between \ 3980 and 3G80. The more refrangible of 
the two strongest and principal bands is the broader, and in a marked manner it is degraded towards the less refrangible 
side. With a plate exposed 30 minutes, magoesium sulphate yields a very strong spectrum, which in parts is too dense to 
show the details in the bands to advantage. A specimen of dolomite showed the spectrum extremely well. 
FLAME SPECTRA AT HIGH TEMPERATURES. 181 
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