GENERAL INDEX 



Pitch-blende, a radio-active sub- 

 stance, 5, 98. 



Pithecanthropus erectus, the fos- 

 sil of the ape-man found by 

 Dr. Dubois in the island of 

 Java, 3, 113. 



Pitt, William, his interest in 

 Fulton's submarine boats, 7, 

 100. 



Pizarro, found cotton growing 

 indigenously in Mexico and 

 Peru, 9, 7. 



Plagues, their influence on me- 

 diaeval medical science, 2, 33, 

 41. 



Planch6, Gaston, his invention 

 of the electric storage battery, 

 3, 246. 



Planet, the, constructed by 

 Stephenson, 7, 135. 



Plateau, M., invented a moving- 

 picture machine called the 

 plaenakistoscope, 8, 249. 



Plato, Aristotle, and Theo- 

 phrastus, Chaper VIII, 1, 

 178. 



Plato, his visit to Egypt to 

 study the mysteries of its 

 fabled learning, 1, 56, 84; the 

 greatest thinker and writer of 

 his time, 1, 180; a mystical 

 dreamer and sociologist, 1, 

 182; considered manual toil 

 degrading, 6, 26. 



Platt, Messrs. Fielding and, 

 their rotary engine, 6, 122. 



Plinius Secundus, the most fa- 

 mous Latin writer of antiq- 

 uity, 1, 265; soldier and in- 

 vestigator, 1, 266. 



Pliny, his unbounded respect for 

 Oriental learning, 1, 56. 



Plutarch, his narrative of the 

 experiments of Archimedes, 



6, 34- 



Plutonists, a name given to the 



followers of Hutton, 3, 131. 

 Poker, lever of the first class, 6, 



3- 



Pole, the quest of the, 7, 47; 

 Henry Hudson's farthest 

 north record, 7, 48 ; discovery 

 of, 7, 49; controversy over 

 the discovery of the pole, 7, 



49; method of determining 

 arrival at the pole, 7, 50. 



Polo, Marco, mistakenly ac- 

 credited with bringing the 

 compass from the East, 7, 46. 



Polonium, discovery of the 

 radio-active properties of, 6, 

 101. 



Ponderable Matter, The Ether 

 and, Chapter IX, 3, 283. 



Popoff, Prof. A., apparatus used 

 by, for sending wireless mes- 

 sages, 8, 54- 



Porta, Giovanni Battista della, 

 early in the seventeenth cen- 

 tury published idea of utiliz- 

 ing steam for raising water, 

 6,83. 



Posidonius, reference to his 

 measurement of the size of 

 the world, 7, 5. 



Post-Socratic Science at Athens 

 Plato, Aristotle, and Theo- 

 phrastus, Chapter VIII, 1, 

 178. 



Potter, Humphrey, cock boy, 

 invention or beam connection 

 for operating engine valves 

 attributed to, 6 , 91; reasons 

 for doubt, 6, 92. 



Pottery and Pottery Making. 

 See Products of Clay and 

 Fire. 



Pouchet, M. F. A., belief in 

 spontaneous generation, 4, 

 1 80. 



Power, transmission of, by 

 means of gears, belts, chains, 

 6, 35-36- 



Powrie, John W., color-screen 

 method adopted by, 8, 243. 



Predynastic period of Egyptian 

 history, the, 1, 28. 



Preece, Sir William H., experi- 

 ments of, 8, 50. 



Prehistoric man, the, 1, 29. 



Prehistoric Science, Chapter I, 



~ ^ 3 " 



Prehistoric science, not a con- 

 tradiction of terms, 1, 3; the 

 distinctive prehistoric and his- 

 toric epochs, 1, 26, 27. 



Prestwich, his conclusions in 

 regard to the flint instruments 



