262 



INDEX. 



PAGE 



Mayer's model atom 155 et seq. 

 Mechanical effect caused by 



corpuscles 71 



Melting-point of the elements, 



relation of, to atomic weight 25 

 Meteorites, the light of 240 



Molecule, definition of 10 



Nebula, stellar 222 



Nebulae, the light of 240 



Niewenglowski's experiment 



83 et seq. 

 Nuclei caused by corpuscles 74 



Octaves of Newlands 



22 



Periodic law, corpuscular ex- 

 planation of group relations 

 of 162 



Periodic law, corpuscular ex- 

 planation of series relation of 163 

 Periodic law, definition of 22 



Periodic law, description of 



26 et seq. 

 Periodic law explained in 



terms of corpuscles 160 



Periodic law, group relations of 30 

 Periodic law, latest table of 28 

 Periodic law, regularities of 29 

 Periodic law, significance of 



39 et seq. 

 Phosphorescence caused by 



Cathode rays 70 



Phosphorescence caused by 



Becquerel rays 98 



Polonium, radio-activity of 130 

 Positive ions, properties of 76 



Positive electricity 188 



Prout's hypothesis 19 



Trout's hypothesis explained 

 in terms of corpuscles 158 



PAGE 



Radio-activity, acquired 112 



Radio-activity, antecedent dis- 

 covery 81 et seq. 



Radio-activity and unstable 

 atoms explained by corpus- 

 cles 168 



Radio-activity, definition of 111 



Radio-activity, discovery of 86 



Radio-active elements, radios 

 active changes in 132 



Radium, activity of, compared 

 with uranium 95 



Radium as a test of the peri- 

 odic law 38 



Radium, discovery of, in pitch- 

 blende 92 



Radium, its supposed relation 

 to uranium 176 



Radium emanation, condensa- 

 tion of 117 



Radium, life of 175 



Radium, position of, hi peri- 

 odic law 94 



Radium, rarity of 94 



Radium, spectrum of 93 



Ramsay, Sir William, on 

 atomic synthesis 256 



Rays, Becquerel, continuous 

 emission of 87 



Rays, Becquerel, effect of a 

 magnet on 101 



Rays, Becquerel, electrical ef- 

 fects of 100 



Rays, Becquerel, existence of 

 three types of 102 et seq. 



Rays, Becquerel, genealogy of 82 



Rays, Becquerel, law of ab- 

 sorption of 96 



Rays, Becquerel, photographic 

 power of 97 



Rays, Becquerel, physiological 

 effect of 99 



