Barns — Diffusion of Vapor into Nucleated Air. 475 



added near the surface of the liquid may actually be the 

 diffusion of the liquid itself. This will even be the case if an 

 aspiration current, as in §1, falls sufficiently short of saturation, 

 supposing always that the velocity of nuclei is relatively large. 

 True, in the experiments which I made the two sets of results 

 for nuclei and for vapors differ in order of values, in distribu- 

 tion among different vapors, in forms of loci, while for carbon 

 disulphide the gradually increasing apertures of the coronas is 

 certain evidence of greater concentration of nuclei. But these 

 and other occurrences may each in their turn be explained away. 



&D 



5. To facilitate the discrimination in question the diffusion 

 of vapor into partially saturated vapor may be computed as 

 has already been done in Table I, where 



v/2\ kt 





)J**-*dq. 



and the initial saturation is j? = -J at t=Q. The results of the 

 table are constructed in figure 2 and from them the parabolas 

 showing the rise of the levels of successively increasing satura- 

 tion may be derived. 



An inspection of figure 5 shows that if the exhaustion were 

 carried somewhat further than corresponds to the lower limit 

 jo = i, the fog-banks would be capped at a definite height, and 

 that the latter would be enormously influenced by slight 



