ItuNNEDY — Large Ions and Condensation- Nuclei from Flames. 67 



rate of disappearance of the nuclei, whether they are uncharged, as in the first 

 series of experiments, or whether, as in the second series, a great proportion 

 of the nuclei are large ions. The rate of disappearance seems to be the same, 

 within the range of experimental error, though of course further work is 

 desirable in order to make this point certain. 



40 



80 



IZO 160 ZOO 



Minutes 



Fig. 9. 



240 



280 



The mean of a number of determinations of 7 is 14 x 10"'°. 

 In all cases of the disappearance of the nuclei when very long intervals are 

 considered, the nuclei disappear more rapidly than according to the formula 



dn 



dt 



- ■yn'-. 



In one experiment the number of nuclei per c.c. at the end of twenty-one hours 



[10*] 



