20 NUCLEATION OF THE UNCONTAMINATED ATMOSPHERE. 



TABLE 10, continued. 24-25 C. Cylinder. 3/> = 3i.2. Promiscuous results. 



* After 24 hours 

 ## 



\fter 24 hours. f After 15 houi 



Apparatus (water) shaken, thereafter glass 



After 2 hours. 



dull. 



In table n, for 3-minute periods between the exhaustions as a safe- 

 guard against partial saturation, the same oscillations reappear (fig. 

 17). Very small inferior coronas are again followed by the larger 

 superior coronas. On the other hand, the larger superior coronas usu- 

 ally precede larger inferior coronas, as above. The case of 5-minute 

 periods between the exhaustions (fig. 18) begins with marked perio- 

 dicity, after which, however, cotemporaneously with the deposition of 

 fog on the glass between observations, periodicity vanishes. 



TABLE n. Periodicity in the condensation of dust-free air. Plug valve. 5/1 = 31.2. 



Temperature = 25 C. 



* Glass fogged during the interval. 



