Film formation on glass and enamel surfaces tended to reduce the sorption of streptococci to these surfaces. When solutes with affinities for the test bacteria were used to produce the surface film, bacterial sorption to that surface was greater than to surfaces coated by indifferent solutes. 2) Streptococci in small aggregates sorbed to glass and enamel in numbers comparable to, of greater than, unaggregated cells. When the test suspension showed visible clumping, sorption was markedly impaired.
