INDEX 321 



Radiation 54 



Radical 9O 



Radioactivity 78, 82, 83, 98 



energy liberated in 286 



Radius of atom 106 



Ramsay, Sir William 237 



Rare gases 295 



Ratio of charge to mass 119 



Ranvier, Louis Antoine 58 



Redi, Francesco 301 



Relativity theory, Einstein's 29, 75, 291 



Reproduction 50, 149, 214, 215, 241 



Respiration 56 



Revolutions of thought 73, 74 



Richter, H. E 297 



Roentgen, Wilhelm Konrad 82 



Roentgen rays 303 



Rohland, Paul 61 



Ross, P. A 287 



Roux, W 220, 221 



Russell, Henry Norris 79 



Rutherford, Sir Ernest 79, 82, 85, 86, 87, 97, 103 



Sachs, Julius 58, 251 



Saha, M. N 79 



Salt 236 



Salts 52, 107 



Science, most important problem of 7 



Scientific activity, the fundamental 26 



Schaefer, Sir Edward Albert 37, 62 



Schleiden, Matthias Jakob 247, 269 



Schuchert, Charles 203, 205, 236 



Schuster, Sir Arthur 291 



Schwann, Theodor 28, 247, 269 



Schwarzschild, K 299 



Sea-water 102 



Seler, Eduard 210 



Sex 216,217 



Shaler, Nathaniel Southgate 25 



Sheldon, H. H 86 



Sidis, Boris 57 



Siegbahn, K. M. G 304 



Simiidae 200 



