AMERICAN 
JOURNAL OF SCIENCE AND ARTS. 
[THIRD SERIES.] 
Art. L.—On Photographing the Spectra of the Stars and Planets ; 
by Henry Draper, M.D. 
4 [Read before the National Academy of Sciences, Oct. 28th, 1879.] 
For many years it has seemed probable that great interest 
would be attached to photographs of the spectra of the 
enly bodies, because they offer to us conditions of temperature 
sed, are formed. 
The recent publications of Lockyer have attracted particular 
