X ILLUSTRATIONS. 



TIG. PAGE 



.31. Spectrum of the cleveite gases ... ... ... .. 84 



32. Same spectrum sorted out into " series " ... ... ... 85 



33. Triplets in spectra 92 



34. Map showing residual lines in the spectra of calcium and 



magnesium 96 



35. Changes of wave-length due to pressure 105 



36. Results of magnetic perturbations on spectrallines .. ... Ill 



37. A f ractionation diagram ... ... ... ... ... 118 



38. Comparison of relative numbers of stars 130 



39. Distribution of bright-line stars in the Milky Way 133 



40. Photograph of glass globe showing Milky AVay 134 



41. Photograph of the same showing distribution of bright-line 



stars 135 



42. Spectrum of Nova Aurigse ... ... ... ... ... 138 



43. Diagram showing time and temperature relations of organic 



and inorganic evolution ... ... ... ... ... 173 



