48 THE CHEMISTKY OF THE SUN. [CHAP. iv. 



mapped by Fraunhofer from the extreme red to the violet, and 

 besides these, certain new lines right beyond the visible spectrum, in 

 the ultra violet. 



In 1843 Draper 1 accomplished a somewhat similar result in 

 what he called a " tithonographic representation of the solar 

 spectrum." 2 In this he showed certain lines in the extreme 

 visible blue and extreme red, and beyond the visible red he 

 found other lines which even Becquerel had not seen ; but his 

 photograph gave no record of any lines in the yellow, orange, 

 or green. 



1 Phil. Mag. vol. xxii. p. 360 (1843). For his earliest work, see Journal 

 Franklin Institute, 1837. 



2 Here we had a foretaste of what photography has since done for us in solar 

 studies. 



