LIST OF ILLUSTRATIONS 



To face page 

 Test-tube containing Radium or other Salt, for Purpose of 



Sterilisation 92 



Test-tubes showing various Cultures • . 92 



Developments during First Week 98 



After a Fortnight 100 



Plates I., II., III., of Developments . . 100, 102 



Leduc's Cells 104 



Lehmarm's Liquid Crystals 106 



Nine Stages of Development of Radiobes . 108, 110, 112, 112(a), 112(6) 



Lehmann Crystals 118, 120 



Sir Wm. Ramsay's Cells and their Effect on Nuclei . . 120 (a) to (e) 



M. Dubois' Vacuolides 122 



Deflection of Radiation in a Magnetic Field and other Properties 



of a-, /3-, y-Rays 126 



Stoney's Diagram illustrating the Periodic Law 227 



Stokes' Demonstration of his Law of Change of Refrangibility . 235 



Method of Measuring Change of Absorption 239 



Nichols and Merritt's Curve for Absorption and Intensity of 



Fluorescence 247 



Phosphorescent Gas Experiments 285 



