Hf. Draper— Oxygen in the Sun. 271 
gen lines, and two such bright lines happen, in some instances 
to fall together. Then, also, it must be remembered that the 
light of the bright lines of the solar spectrum has suffered 
absorption in the solar atmosphere, and in the earth’s atmos- 
re . 
very kind in explaining to me his views, and he did not at all 
we had to deal wit , Was a continuous spectrum with dark lines, 
but when you superpose on this bright lines, so faint that you 
cannot distinguish their brightness from the general back- 
ground of the spectrum, it is evident that the problem becomes 
more complicated. I do not want to express any Opinion one 
Way or the other. I am in the position of a sceptic; 1t may be 
