2.1. Ions and kernels 2,2. Combination coefficients 2.3. Equilibrium conditions 2.4. Measurement of charged and 2.5. Sizes of kernels 2.6. Absence of equilibrium 2.7. Variation of P uncharged kernels S 3. Fine-weather fields and currents . . . . . . . . 3.1. Field current and conductivity 3.2. Measurement of field by collectors 3.3. Measurement by bound charge 3.4. The field mill 3.5. The agrimeter 3.6. Change of field with height 3.7. The idea of convection currents 4.1. The process of point discharge 4.2, Distinction between atmospheric and laboratory point discharge 1.3. Conditions of point discharge 4.4. Relation between point discharge current and field

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Wilson's theory of the acquisition of charges by drops falling through a region containing ions is worked out in detail ; diagrams of the paths of ions and curves of the rates of acquisition of charge are drawn. The applications of the theory to the building up of fields in clouds and to the charging of raindrops are briefly discussed.

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