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The complexity of scientific problems is exemplified in this elaborate system of classification of bacteria. Not long ago bacteria were classified by their morphology into a few simple classes, such as bacilli, cocci and spirilla. Today even this manual of nearly 600 pages is in no sense final but merely a progress report leading to a more satisfactory classification of bacteria in the future. Although published at the direction of the Society of American Bacteriologists, it is not official or standard and has not been formally approved by the society. In the present edition more than 200 additional organisms have been added and two additional tribes recognized, each containing a single genus representing important species of soil bacteria. The dysentery group has been separated from the typhoid group, the former group being placed in genus Shigella Castellani and Chalmers and the latter retained as genus Eberthella. The greater number of
Bergey's Manual of Determinative Bacteriology: A Key for the Identification of Organisms of the Class Schizomycetes.. JAMA. 1930;94(11):817. doi:10.1001/jama.1930.02710370061039