30 CONDENSATION OF VAPOR AS INDUCED BY NUCLEI AND IONS. 



60 



FIGS. 8, 9. Nucleations , ', coronal apertures s/$o, and diameters d, d' , of fog parti- 

 cles observed and computed for the successive partial exhaustion, number z. 



Finally, parts VII and VIII of table n contain measurements of the 

 chord of the angular diameter (radius of 30 cm.) of the outer edge of the 

 green disk s' and the outer edge of the first ring s'" . The minimum may 

 be deduced from s', since 5 = 0.54+ 1.065' has been accepted. From s the 

 optic value of diameter of fog particle d' and the nucleation n' has been 

 computed. The apertures are very fully given in fig. 7, in relation to the 



