EXPERIMENTS Wri'II IONIZED AIR. 



93 



(7) If for <?, the charge of a nucleus, J. J. Thomson's electron be taken ; if the 

 velocity of the nucleus is of the same order as the velocity of the ion in the unit 

 electrical field ; then the number of nuclei iii tlie saturated phosphorus emanation 

 ao'rees with J. J. Thomson's value for the number of ions in ionized air. 



