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The tendency for growth or motion to follow a spiral path is very widespread in nature. Among the bacteria this is rather dramatically illustrated in the group movements exhibited by certain species that swarm over the surface of solid media. Because movement is confined to two dimensions in swarming, the phenomenon provides conditions that are suitable for a study of motion. The swarming of species of Proteus has been observed in detail many times. Less well known are the peculiarities ofdoi:10.1128/jb.58.3.351-359.1949 fatcat:hz6poscitzd7nevsrqdfqil7h4