NUCLEATION CONSTANTS OF CORONAS. QI 



In conclusion, it may be interesting to adduce mean values for the 

 condensation limits as obtained in Chapter III, with the former appara- 

 tus I. They are shown in the table below, and they agree well with 

 the present set, remembering that the values would be slightly below 

 these data if taken from the chart. 



The results of the chapter may be summarized as follows. The 

 endeavor to standardize the fog chamber by a number of distinct but 

 similar samples of radium, used in succession, runs counter to a great 

 difficulty, inasmuch as the effect produced at the line of vision depends 

 upon the position of the radium tubes on the outside of the fog chamber. 

 Moreover, the aperture of the coronas varies only with the sixth root of 

 the rate of production and is therefore not a sensitive criterion. 



The results for vapor nuclei and ions are best seen from the chart. 

 The deductions are similar to those already given at the end of Chapter 

 III. The positions of the condensation and the fog limits have just 

 been stated. These terminal points, as well as the graph as a whole, are 

 reached at lower exhaustions than was the case in Wilson's experiments. 



