356 C. A. Young—Catalogque of bright lines 
Art. XLL—Letter to the Superintendent of the U. S. Coast Sur- 
vey, containing a Catalogue of bright lines in the Spectrum of the 
Solar Atmosphere, observed at Sherman, Wyoming Territory, 
U. S. A., during July and August, 1872; by Prof C. A. 
Youne, of Dartmouth College. 
Prof. B. Perrce, Supt. U.S. C. S., &e., &e. : 
Dear Sir—Without waiting to complete my entire report of 
the spectroscopic work at Sherman, I send for immediate pub- 
lication, should you think proper, a list of the bright lines 
observed in the spectrum of the chromosphere during the past 
summer. 
The great altitude of the station (nearly 8,300 feet), and the 
consequent atmospheric conditions, were attended with even 
greater advantages for my special work than had been really 
expected, although I was never quite able to realize my 
hope of seeing all the Fraunhofer lines reversed, unless once 
or twice for a moment, during some unusual disturbances of the 
. ou : 
oe of these bright lines and their behavior would y ield 
valuable information as to the constitution and habitudes 
of the solar atmosphere. 
In the catalogue, the first column contains simply a referenc® 
number: a ¢ refers to a note at the end of the catalogue. | 
The numbers in the second column refer to my “ Preliminary 
Catalogue,” containing 108 lines, which was published a year 
: : : . a 
ago in the “ American Journal of Science.” In this column 
observations of Lockyer, Janssen, Rayet and Secchi), it is pbaere ae 
possible that some other lines ought to be marked in the a 
manner. : ie 
