108 CONDENSATION OF VAPOR AS INDUCED BY NUCLEI AND IONS. 



TABLE 46 Continued. 



In the first, second, and third series the exhaustion was somewhat 

 above the condensation limit of air, so that the coronas do not vanish. 

 But as the vapor nuclei are relatively inactive as compared with the 

 ions, the initial fall of nucleation is well brought out. The exhaustion 

 is here identical for ions and for water nuclei. 



In series 4, 5, and 6 the exhaustion for water nuclei is below the con- 

 densation limit of air and the coronas vanish in successive partial evacua- 

 tions. It is necessary, therefore, to make the exhaustion for ions (only) 

 above the fog limit of air, as otherwise too few would be caught. The 

 observed march of data is, however, similar to the preceding experi- 

 ments, as is shown in fig. 34. 



