VI CONTENTS. 



Page 



40. Graphs. Dust-free air. Figs. 20, 21, and 22 68 



41. Weak radiation 70 



42. Moderate radiation 70 



43. Strong radiation 70 



44. Other nucleations 70 



45. Temperature effects. Table 30 71 



46. New investigations. Tables 31, 32, and 33; fig. 23 72 



47. Conclusion 75 



CHAPTER IV. The Nucleation Constants 0} Coronas. Continued. 



ON A METHOD FOR THE OBSERVATION OF CORONAS. 



48. Character of the method. Fig. 24 76 



49. Apparatus 77 



50. Errors. Table 34; fig. 25 77 



51. Data. Table 35 78 



52. Remarks on the tables and conclusion. Table 36; fig. 26 81 



DISTRIBUTIONS OF VAPOR NUCLEI AND IONS IN DUST-FREE WET AIR. 



53. Behavior of different samples of radium. New fog chamber 84 



54. Data. Table 37; fig. 27 84 



55. Distributions of vapor nuclei and ions. Tables 38 and 39; figs. 28 and 29.. . 87 



56. Remarks on the table 88 



57. Condensation limits and fog limits. Conclusion 90 



CHAPTER V. Residual Water Nuclei. 



PROMISCUOUS EXPERIMENTS. 



58. Historical 92 



59. Purpose, plan, and method 93 



60. Residual water nuclei after natural evaporation of fog particles. Table 40. . 94 



61. Rapid evaporation of fog particles. Table 41 ; fig. 30 95 



62. Continued. Tables 42 and 43 ; fig. 31 98 



63. Persistence of water nuclei. Table 44; fig. 32, a, b 103 



64. Summary 104 



THE PERSISTENCE OF WATER NUCLEI IN SUCCESSIVE EXHAUSTIONS. 



65. Standardization with ions. Table 45 ; fig. 33 105 



66. Further data. Tables 46 and 47 ; fig. 34, a, b, c 106 



67. Data for vapor nuclei in 



68. Remarks on tables. Table 48; figs. 35, 36, a, b, c, d, e, f, and 37, a, b, c, d . , in 



69. Loss of nuclei actually due to evaporation. Table 49; figs. 38 and 39 117 



70. Conclusion 120 



CHAPTER VI. The Decay of Ionized Nuclei in the Lapse o] Time. 



7 1 . Introduction 121 



72. Data. Table 50; fig. 40 121 



73. Exhaustions below condensation limit of dust-free air. Table 51 ; fig. 41 .... 124 



74. Data for weak ionization. Table 52 125 



75. Further experiments. Table 53; figs. 42, 43, and 44 128 



76. Case of absorption and decay of ions 128 



77. Absorption of phosphorus nuclei. Table 54 130 



78. Data. Table 55; figs. 45 to 49. . 134 



79. Remarks on tables. Tables 56 and 57 135 



80. Conclusion 138 



