TUE STRUCl'lJEE OF THE NUCLEUS. 



TABLE 9.— DIFFUSION. METHYL ALCOHOL, EXHAUSTION, 76-62 cm. l>HOS- 

 PHORUS NUCLEI. CLEAN VESSEL AND FRESH NUCLEI FOR EACH Ol!- 

 SERVATION. FILTERED AIR NOT DRIED. 



TABLE 10.— DIFFUSION. METHYL ALCOHOL. EXHAUSIION, 76-630111. FIL- 

 TERED AIR DRIED. FRESH NUCLEI FOR EACH EXHAUSTION. 



' Veil of 5 cm. or more. 



" Collapse. 



16. Water. — Totally different from nil the preceding cases is the lichavior of 

 water. The diffusion, in the first place is enormously more rapid, so that the 

 vessel is filled with nuclei and the distribution apparently homogeneous in less than 

 a minute. Furthermore the advancing fog is not compact but stringy in character. 

 It makes no dift'erence whether the nuclei are introduced at the top or at the bottom 

 of the diffusion tower. In eitlier case the advance toward the opposite end is of 

 the same nature. Chemical differences between the nuclei (whether coming from 

 phosphorus, punk, sulphui', etc.) are not accompanied by characteristic differences 

 in the results. 



Consequently the rate of dift'usion of nuclei in water vapoi- can not be measured 

 ])y the i^resent method at all, as tlieie is never a true i)lane of demarcation apparent 

 for i-eference. The data given in table 11 are merely intended to indicate the 

 great relative rapidity of the diffusion pi'ocess in the case of aqueous vapor. Ex- 

 planatory remarks will be found in the tal)le. 



