RESIDUAL WATER NUCLEI. 



101 



The values of table 42 refer to different numbers of initial ions. The 

 initial coronas are usually the same (w y o) ; but being obtained at 

 different exhaustions, this corona implies greater nucleation as the 

 exhaustion is higher. The number of ions in the tables has been com- 

 puted by supposing the exhaustion to be faster than the reproduction of 

 ions; i. <?., the number of ions found for the exhausted vessel is always 

 multiplied by the volume expansion, apart from the correction for the 

 increased quantity of water precipitated. It may be questioned whether 

 this hypothesis is justified, but there is no way of testing it. It is also 

 very difficult to understand why the corona remains constant, while the 

 exhaustion, after all ions are caught, continually increases over enormous 

 ranges. 



In table 43 the data of table 42 are summarized, but without referring 

 them to the same initial ionization, as these reductions would be uncer- 

 tain. X = op 3 /p. Notwithstanding the care given the work, the results 

 are far from satisfactory. All series show, however, that the number of 

 residual water nuclei present after the evaporation of a fog originally 

 containing about 100,000 ions per cubic centimeter is smaller as the 

 exhaustion is smaller, as if the water nuclei within certain ranges were of 

 all sizes. 



TABLE 43. Summary of table 42. Filter cock open 30. Data referred to 125,000 



ions, originally present. 



'Made at an earlier date. The filter cock may have been too widely open. 



