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J.C. Draper—Dark Lines of Oxygen in the Solar Spectrum. 451 
division in that spectrum, of the electric oxygen lines given as 
two, by Pliicker, H. Draper and myself. Ido not know what 
the dispersion power was, nor the exact electric conditions that 
gave the forked symbols of oxygen in Angstrém’s chart; but 
whatever the dispersion, and whatever the olecttic, and conse- 
quent thermal or other condition, they seemed to have pro- 
duced results very close in their relation to those in recent 
photographs of the solar spectrum. 
Discussing the existence of bright lines of oxygen in the 
solar spectrum at 44317 and 44319, Mr. Christie directs atten- 
eae! to the opposing fact, that the spaces at 44815 and 48215 
r. Rutherfurd’s photograph are both brighter than those 
at 24817 nd 24819. This is also shown by my beat a: 
a 
region—and there is no reason why we should not do so— 
we are justified in saying, that from 44814 to 44322, and par- 
ei in the vicinity of 44317 and 44819, there is something 
n the solar envelopes, which by absorption, reduces the bril- 
ae of the spectrum. In addition there are also me lines 
which occupy the positions of certain electric oxygen li 
If these faint dark lines are not the result of the aaeron of 
oxygen, to what other cause are they to be attributed? Besides 
the wel] marked lines of calcium and titanium, no one places 
lines of any element here except Huggins, who claims a weak 
strontian line at 44319, and a carbon line as given at 44320, in 
Watts’ Index. The space from 44315 to 14818 is free from 
any claimant, and here there are lines, representing the posi- 
tion of the line of Oxyeen upon which nearly all the meas- 
enlarged paper print in possession is not entirely etalk 
giving pepe appearance of subdivision as I have recorded. 
Conclusions.—1st. The regions in the solar spectrum at 44317 
and 24319 claimed as bright lines of oxygen, are not as bright 
as others in their immediate vici nity 
