196 



INDEX. 



Orionis, f, 67. 

 Oxyg-en, atom of, 96. 



complexity of, 98. 



in hot stars, 60, 163. 



series in, 95, 179, 180. 



spectra of, 31, 180. 



P. 



Paschen and Runge, see Runge. 

 Periodic Jaw and atomic weight, 176. 

 Perry, atmospheres, stellar, 150. 

 Persei , mass of, 149. 

 Perturbations, magnetic, Preston, 167, 



190. 



Pettenkofer, 165. 

 Phosphorescence and gaseous stars, 



151. 

 Pickering:, bright line stars, 132. 



new hydrogen series, 58, 59, 95, 

 98, 178. 



stellar classification, 67, 130. 

 Piscian stars, 70. 

 Plant forms, 153, 171. 

 Pliicker and Hittorf, spectra of ele- 

 ments, 19. 

 Polarian stars, 70. 

 Pole, galactic, 124. 

 Polymerisation, 175, 190. 

 Poulton, Prof., 153. 

 Pressure and wave-length, 101. 



shift, direction of, 105. 

 Preston, Dr., magnetic perturbations, 



110, 113, 167, 187, 190. 

 Prism, action of, 2. 

 Procyon, see Canis minoris a, 68. 

 Procyonian stars, 70. 

 Proto-hydrogren, see Hydrogen. 

 Proto-metals, see Metals. 

 Prout, evolution, inorganic, 165. 

 Puppis, , spectrum of, 58. 



R. 



Ramsay, helium, 48. 

 Reese, Zeeman eflect, 112. 

 Rig-elian stars, 70. 

 Hitter, dissociation hypothesis, 149. 

 Roberts -Austen, dissociation, 76. 

 Rocks, fossiliferous, 153. 

 Runge and Kayser, series and melting 

 points, 97. 



series and temperature, 183. 



series formula, 87. 

 Rung-e and Paschen, oxj-gen series, 179. 



series, 11, 85. 



Rutherford, on stellar spectra, 25. 

 Rydberg- and initial element, 89, 166. 



hydrogen, series of, 95, 178. 



on doubles, triplets, &c., 89. 



series formula, 87, 189. 



S. 



Secchi. 25. 



Selenium, series in, 95. 



Schemer, Dr., magnesium in stars, 



75. 

 Schuster, molecular combination, 74. 



nebula?, 121. 



on dissociation, 144. 



series, law of, 86. 

 shifls, artificial, 107. 

 Series, aluminium, 87. 



and atomic weights, 93. 

 chemical groups, 91. 

 dissociation, 83. 

 melting points, 93, 97. 

 temperature, 183. 



calcium, 97. 



constants of, 87, 88, 189. 



definition of, 11. 



doubles in, 89. 



early notions of, 12. 



formula? for, 11, 87. 



hydrocarbons, 183. 



hydrogen, 178, 179. 

 Balmer, 86. 

 new, 59, 98. 

 Stoney, 86. 



irregularities in, 91. 



laws of, 86. 



magnesium, 97. 



metals, 97. 



nebulous, 89. 



nomenclature of, 89. 



oxygen, 95, 163. 



principal, 89. 



Runge and Paschen, 85. 



sharp, 89. 



single lines, 89. 



sodium, 179. 



thallium, 87. 



triplets, 89. 

 Shifts, artificial, 107. 



pressure, 102, 105. 

 Silicium, in stars, 61. 

 Sirian stars, 70. 

 Sirius, see Canis Majoris o, 68. 

 Sodium, longs and short?, 24. 



series of, 178, 179. 

 Space, absorption in, 131. 



chemical elements in, 142. 



chemistry of, 120. 



distribution of helium in, 142. 

 Spectroscope, grating, 9. 



laboratory, 8. 



simple, 2. 



stellar, 16. 

 Spectrum, bright line, 5. 



continuous, 4. 



dark line, 12. 



definition of, 2. 



discontinuous, 5, 12. 



length of, and temperature, 5. 



