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From the ist of November, 19o4, until the ist of May, 19o5, there were studied sixty-nine strains of organisms which appeared to belong to the groups of streptococci and pneumococci. The morphological, biological, and pathogenic properties of these organisms were investigated. For convenience of description and study all these bacteria were grouped into three main classes, Series A, Series B, and Series C. Series A comprised all the organisms isolated from the saliva of healthy individuals, by the inoculation of the saliva into mice and rabbits, by making streak plates from the buccal secretion, or by both methods. Series B included all the organisms obtained from pathological conditions, which from their cultural characteristics and effects upon animals were thought to be pneumoccoci. Series C included all the organisms obtained from pathological conditions which from appropriate tests were considered as streptococci. METHODS.

A COMPARATIVE STUDY OF PNEUMOCOCCI AND STREPTOCOCCI FROM THE MOUTHS OF HEALTHY INDIVIDUALS AND FROM PATHOLOGICAL CONDITIONS