n8 



CONDENSATION OF VAPOR AS INDUCED BY NUCLEI AND IONS. 



(or its equivalent) and not due to the dissipation of the water nuclei in 

 the lapse of time. It might be supposed, for instance, that water nuclei 

 obtained from the fog condensed on the ions are smaller and therefore 

 diffuse more rapidly than water nuclei obtained by other methods. 

 If so, then if the time between the successive exhaustions is doubled, 

 trebled, etc., the loss should be correspondingly increased. 



TABLE 49. Successive exhaustion after different time intervals. Ions due to gamma 

 rays. Bar. 76.1 cm.; temp. :8C.; ^3=22.9 cm. For ions, dp 3 /p = o.j,oi; 8p s = 

 17. 7 cm. For water nuclei, [Sp 2 ] = 17.0 cm.; 8p 3 /p = o. 232; v l /v=i.2i. 



1 g to gy corona. 



Table 49, constructed on the above plan but containing the time 

 interval t, in minutes between the exhaustions, shows that the time effect 

 is secondary. The table gives n with correction for the exhaustion or 

 volume increase v l /v. 



The data are represented in fig. 38, the abscissa being the time in 

 minutes, the ordinates showing the nucleation. The curves indicate 

 a steady progression toward the right as the time interval increases, 

 showing that the time losses, although not necessarily absent, are not of 

 serious importance. In fact, in fig. 39 the group for i -minute and 6- 

 minute intervals constructed in terms of the number of exhaustions 

 (ignoring lapse of time) are virtually coincident. Again, the curve for 



