ON WAVE-LENGTU TABLES OF THE .SPECTKA OF THE ELEMENTS. 263 



The Tellueic Lines of the Solae Specteum — contimted. 



Interim Report of the Committee consisting of Professor Thobpe, 

 Professor Hummel (Secretary), Dr. Perkin, Professor Eussell, 

 Captain Abney, and Professor Stroud, on the Action of Light 

 upon Dyed Colours. Drawn up by the Secretary. 



The primary object of the -work of this Committee is to determine 

 accurately the relative fastness to light of all the various colours at 

 present employed by the dyer of textile fabrics. This is to be attained 



