Bergey (1907) is generally credited with the fir'st isolation of Actinomyces from the normal human mouth. Since then there have been a few reports of the recovery from the normal oral cavity of organisms which appear to have been identical, or nearly so, with strains isolated from clinical actinomycosis (Emmons, 1935, 1936,
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Howell et al. (1959) studied this question.