l8 CONDENSATION OF VAPOR AS INDUCED BY NUCLEI AND IONS. 



and varying p m (lower pressure limit, p, variable) and second by keeping 

 p fixed and varying p r and p 3 (upper pressure limit variable). Tables 

 7 and 8 show these data, the latter for a wider range of coronas than the 



FIG. 5. Nucleation of dust-free air for different drops of pressure Sp = p p. 2 ; [dp]' 

 denoting that the upper limit, [<?/>], that the lower limit of the drop of pressure dp 

 I is varied. Also corresponding nucleation referred to the exhaustion Sp/p. Four 

 I series. Small ranges of nucleation as compared with fig. 6. 



former, while n denotes the number of nuclei per cubic centimeter. 

 From 5 the number of nuclei, n, per cubic centimeter is computed. 



The results, moreover, are graphically given in figs. 5 and 6, the abscis- 

 sas being the drop dp=pp 2 , the ordinates nX io~ 3 . It will be seen at 

 once that the two curves ([dp\ denoting that the lower limit of pressure, 



