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Electrons Produced by Passage of X-Rays through Air 262     From the Smithsonian Report, 1915. Magnetic Deflection of Radium Rays 263 Professor R. A. Millikan's Apparatus for Counting Electrons 263     Reproduced by permission of Scientific American. Making the Invisible Visible 266 The Theory of Electrons 267 Arrangements of Atoms in a Diamond 267 Disintegration of Atoms 270 Silk Tassel Electrified 270     Reproduced by permission from The Interpretation of Radium (John Murray). Silk Tassel Discharged by the Rays from Radium 270 A Huge Electric Spark 271 Electrical Attraction between Common Objects 271     From Scientific Ideas of To-day. An Electric Spark 274     Photo: Leadbeater. An Ether Disturbance around an Electron Current 275     From Scientific Ideas of To-day. Lightning 278     Photo: H. J. Shepstone. Light Waves 279 The Magnetic Circuit of an Electric Current 279 The Magnet 279 Rotating Disc of Sir Isaac Newton for Mixing Colours (Coloured Illustration) 280 Wave Shapes 282 The Power of a Magnet 282 The Speed of Light 283     Photo: The Locomotive Publishing Co., Ltd. Rotating Disc of Sir Isaac Newton for Mixing Colours 283 Niagara Falls 286 Transformation of Energy 287     Photo: Stephen Cribb. "Boiling" a Kettle on Ice 287     Photo: Underwood & Underwood. The Cause of Tides 290 The Aegir on the Trent 290     Photo: G. Brocklehurst. A Big Spring Tide, the Aegir on the Trent 291     Photo: G. Brocklehurst.