February, 1915. 



KNOWLEDGE. 



35 



.\ li! ONIS 



I 

 77 I V ^ \ K 



IT I r 



1 ' E. M4< 



a. Lyr/E 



HHffT^iW I 



6 n 



Figure 25. 



Heliu-tn ■ Rl&EL 



bMiciwTn. -Titanii/ 



a. Cy&nt 



hrom Spectrograms 



Figure 26. 

 The Spectrum of Hydrogen as observed in the Stars. 



