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Although the anaerobic, non-sporulating, pointed bacilli of the mouth, which are now grouped in the genus Fusiformis, have been cultivated since 1898 (Veillon and Zuber), much confusion still exists concerning their properties and relationships. The literature dealing with this group of bacteria is large, but it consists mainly of efforts to establish their pathological significance on the basis of occurrence. Only a few systematic studies have been attempted, and the findings of these investigations have been contradictory. Krumwiede and Pratt (1913) divided 15 strains of Fusiformis into 2 classes by means of the fermentation of sucrose. Knorr (1922) created 3 morphological groups on the basis of his study of 4 strains. He employed Fusobacterium as the generic name. This classification was used later in "Determinative Bacteriology" by Lehmann-Neumann-Breed (1931). Varney (1927) divided 18 strains into 4 types and 2 subtypes on morphological and serological grounds. Pratt (1927), repeating her earlier work, found 2 morphological groups and concluded that serological procedures had little value in the classification of Fusiformis. As a result of his investigations, Smith (1932) was led to accept 3 morphological types. Bibby and Knighton (1933) reached the same conclusions. Like Pratt, they were unsuccessful in their attempts to employ serological methods. The most extensive study of Fusiformis was made by Slanetz and Rettger (1933). They studied 53 strains isolated from many sources and were

Morphological and Cultural Studies of the Genus Fusiformis