1. 1 Rappin, J. , Contribution à l’étude de bactéries de la bouche à l’état normal, 1881; 68; quoted by Breed, R. S. , Murray, E. G. C. , and Hitchens, A. P. , in Bergey's Manual of Determinative Bacteriology, 6th ed., Williams & Wilkins, Baltimore, 1948, 217.