Abstract
Measurements of electrophoretic velocities on strains of pneu-mococci and other organisms indicate that many vital phenomena are closely associated with the electrokinetic P. D. between the organism and its menstruum.It has become evident from the work of Falk and his associates1 that there are significant parallelisms, direct or inverse, between electrophoretic potential, virulence, agglutinability and other characteristics of bacteria. For pneumococci of the types 1, 2, 3, 4 it has been found that the P. D. is higher the greater the virulence for white mice and vice versa.The work here reported was undertaken to determine whether or not P. D. would parallel virulence of various strains of diphtheria bacilli as well as to obtain comparable data in regard to P. D. on avirulent or pseudodiphtheria bacilli.The cataphoretic potentials on corynebacteria were determined by the method described and used by Falk, Gussin and Jacobson.1 For reasons discussed by them results are expressed in terms of observed veloc...
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