406 



KNOWLEDGE. 



November, 1913. 



From spectrograms taken with- a 2-prism Jliut spectroscope by E. 11. Hills, Pulgaon, India, January 22nd iSq-S. 



Figure 422. A :,: and B I , spectra showing the flame bands of the reversing layer of the Sun seen during an eclipse. 

 C, the dark lines of the ordinary spectrum when the Sun shines through glowing metallic vapours. 



* At point of second contact. t At point of third contact. 



TlTR* 



LyR/6 



Castor - F«mr<?rStaf 



Fiom spectrograms by William Hu^gins, Tulsc llni. 



Figure 423. Spectra of pre-solar stars (compared with the Sun) showing the many dark bands of hydrogen, all of which 



become bright bands at a certain stage in the life-history of novae. 



