60 



EXPERIMENTS WITH IONIZED AIR. 



TABLE 14— NON-IONIZATION OF DUST FROM CONC. SULPHURIC ACID AND 



AMMONIUM POLYSULPHIDE. 



I conclude, therefore, that neither Kelvin's nuclei nor Aitken's " dust" particles 

 have yet been downed by the wily ion. I ;idiiiit tliat an electric field may sometimes 

 stress ions out of them, leaving the nuclei to do the condensation. 



