Abstract
It is shown that there must be six. not just four electrokinetic phenomena involving the ionic double layers on solids making contact with liquids. In one of these, the emission of electromagnetic waves from mechanically stimulated colloid systems should be observable. This prediction is based upon the fact that suspended particles in polar liquids normally bear an ionic double layer of charge. The outer liquid-borne portion is readily distortable. Cyclic distortion of it will produce a radiating dipole. Preliminary experimental results show silica gel and yeast (Saccharomyces cerevisiae) suspensions to produce such electromagnetic radiation. The electromagnetic noise in the natural motions of sea and fresh waters may be due in part to this phenomenon.

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