J. M. Silliman— Examination of the Bessemer Flame. 805 
observed except two or three in the latter spectrum. 
brightest calcium line, however, was not visible in the Bessemer 
spectrum. The Bessemer spectrum contains yet many mysteries 
to be solved, among which is the cause of the non-appearance 
of the lines of the spectrum at the beginning and termination 
trum at the beginning and termination of the blow is because 
acteristic line, but, according to Simmler, a much larger quantity 
of manganese is needed to obtain a recognizable reaction than 
that which can be detected by the well known blow-pipe reaction 
with carbonate of Consequently, spectrum analysis does 
not depend alone upon the presence of a body but also upon the 
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