7111 



PLATES. 



PAGE 



Photographs illustratiun- Radio-activity of Matter 



85. 87, 88,89, 90. 91, 92 



Nile Dams and Reservoir .. .. 186. 188, 190, 192, 193, 194 



Liquid Air Apparatus .. .. .. .. .. 224 



Formulae — Distributiou of the Atmosjjheric Gases 226,227 



Volcanic Eruption, Mont Pelee -. .. .. .. .. 234 



Photographs of a Right and a Left Hand . . , . 306 



Photographs — Impressions of Seoul .. 500, 502, 504, 606, 508 



Maps and Illustrations — Sleeping Sickness in Uganda 



510, 612,614, 516,518 



Photographs — Progress of Oceanography 548,549,650 



