The Evolution of the Sciences 



RADIO-ACTIVE bodies, 72, 107 



Radio-activity induced, 74 



Radium, 72, 74, 75, 279 



a rays, 72 



ft, y and X-rays, t 74 



Radium, emanation of, 75 

 ,, energy of, 79 

 ,, transformation, 75^f 

 ,, rays of, 108 



Ramsay, Sir W., 30, 61, 63, 75, 77, 

 80, 280 



Rare earths, 68 



Rayleigh, Lord, 65 



Reichsanstalt, 311 



Resolvable nebulas, 239 



Reversible reactions, 57 



Richter, 24 



Rontgen rays, 101-1 



Rotation of sun, 164 



Rutherford, 72, 75 



SCHUSTER, 154 



Sciences, classification of, 59 



Secchi, 158, 161, 162, 182, 200 



Seismographs, 132 



Shape of the earth, 118 



Simon, in 



Solar constant, 155 



Solar spectrum, 173, 175 



Soluble ferments, 262 



Southern Cross, 242 



Specialisation, 292 



Spectrum analysis. 62, 169 ff 



Spectrum of nebulae, 240 



Sperenberg, 128 



Statics, chemical, 37 



Stellar parallax, 223 



Structural formuloe, 28 



Structure of atom, 105 



Struve, 224 



Suess, 141 



Sun's heat, i$$/ 



Sun spots, 1 6 iff, 1 68 



Syntheses, organic, 34, 2^1 



TAIL of comets, 216 



Taine, 307 



Telescope, reflecting. 160 



Temperature of earth, 124 



sun 



Temporary stars, 243 

 Tetanus, 284 

 Thermo-chemistry, 41 

 ,, dynamics, 45 

 Thomsen, Julius, 37 

 Thomson, J. J., 100, no 

 Thorium, 76, 83 

 Totality of eclipse, 200 

 Transformation of radium, 

 Transmutation, 60 

 Traube, 274 

 Tycho-Brahe, 244 



UNIVERSITIES, 291 



VAN HELMONT, 290 



Van t'Hoff, 38 



Velocity of stars, 231 



Vital force, 35 



Viscosity of ether, 99 



Vitalism, 260 



Vogel, 249 



Vogt, Carl, 129 



Volcanoes, 141 



Volta, 144 



Volume of sun, 152 



Von Schron, 265 



Vortex theory of matter, 113 



WEIGHT, 91 



Weights, atomic, 66-7 



Wilson, 1 68 



Work, principle of maximum, 4] 



X-RAYS, 101, 107 

 Xenon, 30, 65 

 Xenophanes, 151 



YOUNG, 216 



ZERO, absolute, 47 

 Zeta Orionis, 243 



31* 



