662 
For the positive charges we believe the entire molecules to be answer- 
able on account of their volatility and their surface-activity. The negative 
charges we believe to be evoked by the anions, which, conformably 
to Lunarp’s hypothesis regarding waterfall-electricity, are in the 
majority in the outer layers of the drops, when they impinge on 
the disc. 
Addition of sugar molecules drives the dissolved entire molecules, 
together with the ions of the discussed substances, to the surface. 
