INDEX.

Polarization of uranium rays absence of, 7
Polonium methods of separation of, 22 rays from, 23 decay of activity of, 23 discussion of nature of, 24 similarity to radio-tellurium, 26 magnetic deviation of α rays from, 146, 150 slow moving electrons, 153 increase of absorption with thickness of matter traversed, 163 connection of, with radium F, 411
Potential required to produce saturation, 32 et seq. fall of potential needed to produce ions at each collision, 58 gradient due to movement of ions, 65
Precht and Runge spectrum of radium, 17 atomic weight of radium, 18 heating effect of radium, 420
Pressure effect of, on velocity of ions, 46 effect of, on current through gases, 61 et seq. production of emanation independent of, 265 effect of, on distribution of excited activity, 317 effect of, on natural conductivity of air in closed vessels, 534
Products, radio-active list of, from radio-elements, 448 properties of, 448 amount of in radium, 452 et seq. radiations from, 455
Quartz piezo-électrique use of, in measurement of current, 105
Quinine sulphate discharging power of, 530 phosphorescence of, 530
Radiations emitted by uranium, 8 emitted by thorium, 10 emitted by radium, 18 emitted by actinium, 21 emitted by polonium, 23 method of measurement of, 82 et seq. methods of comparison of, 108 three kinds of, 109 analogy to rays from a Crookes tube, 110 relative ionizing and penetrating power of, 111 difficulties of comparative measurement of, 112 β rays, 113 α rays, 141 γ rays, 179 secondary rays, 187 comparison of ionization of α and β rays, 194 phosphorescent effect of, 201 et seq. physical actions of, 207 et seq. chemical actions of, 213 et seq. physiological actions of, 216 from the emanation, 263 from Ur X, 347 connection of, with heat emission, 421 et seq. from different active products, 455 conservation of energy of each specific type of, 469 et seq.
Radio-lead connection of, with polonium, 411 et seq. connection of, with radium D, 413
Radio-tellurium rate of decay of, 411 connection of with radium F, 411

552