The correlation observed between the velocity of migration of small particles in suspension in an electric field, and the phenomena of flocculation at or near a point where the velocity is a minimum, has given rise to the theory that the stability of the suspension is a function of the charge, and that the mutual repulsion of the particles due to the charge is the mechanism involved.
R. S. Lillie (1902), -Gray (1915) have shown that spermatozoa carry a negative charge in a medium near the neutral point, and consequently that they migrate towards the positive pole when placed in an electric field. In this respect the properties of the sperm fall into line with those of most unicellular organisms (Winslow, Falk, and Caulfield, 1923).
The following experiments were undertaken to determine whether any relation existed between the charge and the phenomena of “aggregation,” “agglutination,” etc.,...
