xiv CONTENTS 



CHAPTER XVII 



BADIO-ACTIVITT AND PHOSPHOEESCBNCE 



PAGE 



Molecular theory of phosphorescence and of radio-activity — 

 Analogy between phosphorescent molecules and those of 

 radio-active emanation from thorium and radium com- 

 pounds — Model of radio-active and phosphorescent mole- 

 cules — Model of positive ion — The electric theory of 

 matter 292 



CHAPTER XVIII 



MODELS OP POSITIVE ION OE ATOMIC NUCLEUS 



Fluorescence of monatomic gases — Effect of specific inductive 

 capacity on molecular aggregation — Difficulties in the 

 kinetic theory — Nature of positive nucleus — Effect of ap- 

 proach of corpuscles on motion in nucleus — Balmer's law 

 — Ramage's observations — Transmutation of the elements 

 of same series — Aggregations produced by pressure — 

 Models of molecules in phosphorescent gases and in 

 emanations 308 



CHAPTER XIX 



MATTER AND " MIND-STUFF " 



Conclusions — Resume of what has been said — Biogen is matter 

 in process of becoming or being transformed from free elec- 

 tricity into condensed electricity, called atoms — Universal 

 nature of physical metabolism — Matter a mode of motion — 

 Motion a complex perception or mode of thought — Two 

 modes of thought, our own minds and matter are concomi- 

 tant — Difficulty solved by Idealism — Berkeley and Hume — 

 Their respective positions — Mind-stuff, how reconciled with 

 Idealism — The permanent source of possible sensation . . 332 



