INDEX. 



Absorption in splieriral condensers, 83 

 Absorption of dust in tul)es, 34, 3(> 

 Absorption of dust, Theory of, 36 

 Absorption of dust witliout decay, 39 

 Absorption of ions in ])late condensers, 't2 

 Absorption of ions in tube condensers, 66 

 Air temperature. Effect of, 6, 36 



Bell, Alexander G., v 

 Bidwell, P., VI 



Computation of absorbed <lust, 39, 40 



Condenser plates, Effect of distance of, 49 



Condensers, Spherical, 71 



Condenser, Tubular, 63 



Current, Electric, in condensers, 46 



Currents in spherical condensers, 71 



Cliattock, VI, 53 



Color and number of nuclei, 18-30, 31, 33 



Color, Margins of, 34 



Color sequences, 4. 5 



Color tube, 1 



Color tube. Graduation of, 33, 27, 30, 31, 61, 63 



Color tube, modified, 38 



Decay of ions. Absence of, 89 

 Decay of nuclei, 13 

 Diffusion in spherical condensers, 85 

 " Dust" producers, 7-10 



Electric field, Effect of, on ions, 64, 67 



Helmholtz, 5 



Ionizers, 7, 59 



Ionizers, Electric, 10, 11 



Ionizers, X-ray, 13 



Ionizers, Ultraviolet, 15 



Ionizing activity. Decay of. 44, 45 



Ions absorbed in tube condensers, 66 



Ions escape from plate condensers, 53 



Ions, Number of, in saturated emanation, 11, 53, 60, 91 



Ions related to nuclei, 65 



Ions withdrawn by electric field, 64 



Jet, 4 



Kiessliiig, 4 

 King, Clarence, v 



Mechanism, Electrolytic, 54 



Nuclei, Cause of velocity of, 70 



Nuclei, Number of, 11, 53, 69. 91 



Nuclei, Persistence of, 12-14 



Nuclei related to ions. 6.-) 



Nuclei, Velocity of, 39, 40, 70 



Number of ions in saturated emanation, 11, 53, 69, 91 



Opaque region, 6, 34 



Reynolds, O., 5 

 Rutherford, v, 53 



Saturated emanation, 11, 53, 69, 91 

 Spherical condensers. Absorption in, 83 

 Spherical condensers. Data for. 84, 90 

 Spherical condensers. Diffusion in, 85 

 Steam pressure. Effect of. 25 

 Steam tube, 1 



Temperature, Effect of, on ionizer, 45 



Temperature, Effect of, on transmission, 58 



Theory of absorption in tubes, 38, 40 



Theory of ion absorption by plates, 53 



Theory of ion absorption in spherical condensers, 83 



Theory of ion absorption in tube condensers, 66 



Thomson, J. J., v, 53 



Townsend, v 



Transmission of ions through media, 55 



Transmission of phosphorus emanation, 33, 43 



Tube condensers, 63, 66 



Tubes, Thin, absorption of, 34 



Wilson, C. T. R., V 

 Wilson, H. A., V 



Zelenv. v 



95 



