160 
THE LINES OF THE SOLAE SPECTETFM. 
appear at times fainter lines, one of which coincides with B, and a bundle sometimes 
appears in about the position of a. 
Fig. 11 represents a series of lines, principally orange, that appear in the spectrum of 
a spirit-lamp flame, on the wick of which nitrate of strontia has been placed. It is 
from a drawing by Sir David Bkewstee, and its position in the spectrum is indicated by 
the ordinary letters. The yellow line coincident uith D is very prominent. 
P.S. Much additional light has been thrown on these l umin ous bands, and then- 
relation to the dark lines of the solar spectrum, by the recent labours of continental 
observers. 
