The Evolution of the Sciences 



Collaboration, 310 

 Colloidal state of metals, 263 

 Colloids, 272 

 Colours of the stars, 242 

 Companion of Sirius, 254 



, , Procyon, 254 



Corona, 185, 201, 210, 212, 214 

 Coronium, 211 

 Crookes, 69 

 Crystalloids, 272 

 Curie, M. et Mme., 74, 76, 100 



DARWIN, Sir G., 117 



Definition of matter. 87 



Degree, geothermic, 128, 129 



De Herrara, 270 



Delage, Yves, 277 



Delille, 205 



Density of ether, 98 



Density of the sun, 153 



Deslandres, 212 



Development of sun spots, 162 



Deville, Henri Sainte-Claire, 38, 50, 



302 



Dewar, 30 



Dimensions of stars, 226 

 Displacement of lines of spectrum, 



1 66, 212 



Dissociation, tension, 50 

 Distances of stars, 226 

 Du Bois-Reymond, 269, 279 

 Duclaux, 219 

 Duhem, 45 

 Dumas, J. B., 52, 66 

 Dynamics, thermo, 45 



EARTH, mass of, 120 



,, mean density of, 1 20 

 ,, shape of, 118 



Earthquakes, 132, 135 



Eclipse of 30th Aug. 1905, 197 



Eclipses, 195^" 



Electrical manifestation of life, 282 



Electricity, 95, 1 14 



Electro-chemistry, 304 



Electron, 105, 107, 108 

 , , mass of, 104 

 ,, apparent mass of, HO, 112 



Element, 24, 64, 66 



Elements, groups of natural, 70 



,, unstable, 85 

 Emanation of radium, 75, 76, 81 

 Emission, spectrum, 170 

 Energy, conservation of, 38 

 Energy of radium, 79 

 Enzymes, 262, 306 

 Epicentre, 134 



Epidemics among tin buttons, 268 

 Equilibrium, chemical, 48, 54 

 Ether, 96, 98 



density of, 98 



, , viscosity of, 99 

 Excitability, 281 

 Exposition du systeme du monde, 117 



FACUL,*:, 161 

 Fatigue, 284 



,, of platinum wire, 285 

 Fittica, 72 

 Fischer, 261 

 Fontenelle, 61 



Formula of albumen of blood, 272 

 Formulae, structural, 28 



GALACTIC circle, 222, 237 

 Galileo, 159 



Geothermic degree, 128-9 

 Gibbs, 45 

 Glaser, 22 

 Graham, 272 

 Gravitation, 119, 152 

 Growth of chemistry, 56 



HALO, 201, 215, 217 



Halwarda, 246 



Helium, 30, 65, 72, 76, 77, 81, 83, 



1 80 



Helmholtz, 45, 113 

 Herschel, Sir W., 160, 256 

 Homogeneity of heavens, 227 

 Hopkinson, 117 

 Hot springs, 125 

 Huggins, 1 80, 240 

 Hydrogen, 179 

 Hypothesis, scientific, 115 



IMPENETRABILITY, 87 

 Induced radio, activity, 74 



316 



