XVI 



LIST OF ILLUSTRATIONS 



PAGE 



184 

 189 



Fig. 31 . 



Fig. 32 . 



Fig. 33 . 



Fig. 34 . 



Fig. 35 . 



Fig. 36 . 



Fig. 37. C Line in the Spectrum of a Sun- 

 Spot 



Fig, 38. October 9, 3*^- 30™- Calcium Flocculi, H2 



Level ..... To face 281 



Fig. 39. October 9, i*'- 04"^- Hydrogen 



Flocculi .... To face 282 



Fig. 40. Diagram to explain the Phenomena of 



Comets' Tails .... To face 294 



Figs. 41 and 42. Regular and Spiral Nebula To face 300 



To face 2^^ 



