Early Life-History of the Salmon 196 The Salmon Leaping at the Fall is a Most Fascinating Spectacle 197 Diagram of the Life-History of the Common Eel (Anguilla Vulgaris) 200 Cassowary 201     Photo: Gambier Bolton. The Kiwi, Another Flightless Bird, of Remarkable Appearance, Habits, and Structure 201     Photo: Gambier Bolton. The Australian Frilled Lizard, which is at Present Trying to Become a Biped 202 A Carpet of Gossamer 202 The Water Spider 203 Jackdaw Balancing on a Gatepost 208     Photo: O. J. Wilkinson. Two Opossums Feigning Death 208     From Ingersoll's The Wit of the Wild. Male of Three-Spined Stickleback, Making a Nest of Water-Weed, Glued Together by Viscid Threads Secreted from the Kidneys at the Breeding Season 209 A Female Stickleback Enters the Nest which the Male has Made, Lays the Eggs Inside, and then Departs 209 Homing Pigeon 212     Photo: Imperial War Museum. Carrier Pigeon 212     Photo: Imperial War Museum. Yellow-Crowned Penguin 213     Photo: James's Press Agency. Penguins are "A Peculiar People" 213     Photo: Cagcombe & Co. Harpy-Eagle 216     Photo: W. S. Berridge. The Dingo or Wild Dog of Australia, Perhaps an Indigenous Wild Species, Perhaps a Domesticated Dog that has Gone Wild or Feral 216     Photo: W. S. Berridge, F.Z.S. Woodpecker Hammering at a Cotton-Reel, Attached to a Tree 217 The Beaver 220 The Thrush at its Anvil 221     Photo: F. R. Hinkins & Son. Alsatian Wolf-Dog 226     Photo: Lafayette. The Polar Bear of the Far North 227     Photo: W. S. Berridge. An Alligator "Yawning" in Expectation of Food 227     From the Smithsonian Report, 1914. Baby Orang 232     Photo: W. P. Dando. Orang-Utan 232     Photo: Gambier Bolton. Chimpanzee 233     Photo: James's Press Agency. Baby Orang-Utan 233     Photo: James's Press Agency. Orang-Utan 233     Photo: James's Press Agency. Baby Chimpanzees 233     Photo: James's Press Agency. Chimpanzee 238     Photo: W. P. Dando. Young Cheetahs, or Hunting Leopards 238     Photo: W. S. Berridge. Common Otter 239     Photo: C. Reid. Sir Ernest Rutherford 246     Photo: Elliott & Fry. J. Clerk-Maxwell 246     Photo: Rischgitz Collection. Sir William Crookes 247     Photo: Ernest H. Mills. Professor Sir W. H. Bragg 247     Photo: Photo Press. Comparative Sizes of Molecules 250 Inconceivable Numbers and Inconceivably Small Particles 250 What is a Million? 250 The Brownian Movement 251 A Soap Bubble (Coloured Illustration) 252     Reproduced from The Forces of Nature (Messrs. Macmillan). Detecting a Small Quantity of Matter 254     From Scientific Ideas of To-day. This X-Ray Photograph is that of a Hand of a Soldier Wounded in the Great War 254     Reproduced by permission of X-Rays Ltd. An X-Ray Photograph of a Golf Ball, Revealing an Imperfect Core 254     Photo: National Physical Laboratory. A Wonderful X-Ray Photograph 255     Reproduced by permission of X-Rays Ltd. Electric Discharge in a Vacuum Tube 258 The Relative Sizes of Atoms and Electrons 258 Electrons Streaming from the Sun to the Earth 259 Professor Sir J. J. Thomson