RESIDUAL WATER NUCLEI. 



2 -minute intervals actually shows less loss (due to favorable exhaustion 

 conditions) than the curve for i -minute interval. 



In series 6 radium was left in place except during the exhaustion, 

 (for ions are efficient in presence of water nuclei). It is seen, however, 

 that the water nuclei stored in this ionized field do not decay more 

 rapidly than in ordinary dust-free wet air. 



/ 2 3 



4- 



180 



160 



FIG. 38. Nucleation of residual water nuclei in successive identical exhaustions made 

 at different intervals of time apart. Fog particles precipitated upon ions. 



FIG. 39. The same, constructed for successive exhaustions and ignoring the time 

 intervals. 



All the results might be made more striking by reducing them to the 

 same initial nucleation or ionization. Just how differences in these 

 values arise is difficult to affirm, but all the after effects in the successive 

 exhaustions are usually consistent. It does not follow, however, that 

 the correction is to be made by proportionately increasing all the low 

 nucleations by the amount required in the primary nucleation. Series 

 7 and 8 were therefore added specially with a view to normally large 

 initial nucleations. 



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LH 



