J. C. Draper—Dark Lines in the Solar Spectrum. 268 
Space extending from 4254°30 to 484515, many of the oxygen 
lines are assigned to wave lengths occupied by other elements ; 
for example, Cr, Ca, Sb, Ti, C, Bi. As other lines of these ele- 
ments did not present themselves in the measured photographs, 
and as the lines in question were also found in the photographs 
of the spark between platinum terminals they are to be regarded 
Tiority of this method of recording the existence and positions 
of Spectrum lines throughout the region over which it can act. 
Out of the sixty-five lines of the solar spectrum which are as 
Am. Jour. 8ci.—Turep Serres, Vo. XVI, No. 94—OcT., 1878. 
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