CONTENTS. IX 



Page. 



71. Nucleation increases subject to a uniform law of equilibrium 109 



72. Data for coal gas no 



73. Character of the early results for coal gas no 



74. New data for coal gas in 



75. Conclusion 112 



COLLOIDAL NUCLEI AND IONS IN DUST-FREE AIR SATURATED WITH ALCOHOL 



VAPOR. 



76. Introductory 112 



77. Apparatus and method 113 



78. Properties of alcohol fog 113 



79. Number of particles 113 



80. Size of the nuclei 115 



81. Data for alcohol vapor 118 



ABSENCE OF COLLOIDAL NUCLEI IN STRONG ODORS. 



82. Introductory 120 



83. Data for camphor, turpentine, naphthalene 120 



84. Summary 121 



Chapter V. The Cotemporaneons Variations 0} the Nucleation and the Ion- 

 ization 0} the Atmosphere 0} Providence. By Lulu B. Joslin. 



85. Introduction 1 23 



86. Measurements of nucleation 1 24 



87. Data for nucleation 125 



88. Remarks on the table of nucleation 125 



89. Mean daily nucleation 125 



90. Mean monthly nucleations 141 



9 1 . Measurement of ionization 141 



92. Data for ionization 143 



93. Remarks on the tables 149 



94. Errors of measurement 150 



95. Mean daily ionization 152 



96. Mean monthly ionizations and conclusion 153 



Chapter VI. The Variations 0} the Colloidal Nucleation 0} Dust-Free 



Air in the Lapse 0} Time. 



97. Introductory 155 



98. Method and data 155 



99. Deductions 157 



100. Effect of the barometer 158 



101. Corrections 159 



102. Further data 160 



103. Conclusion 164 





