Abstract
SYNOPSIS. In a preliminary search for a phototactic response in Tetrahymena, we discovered instead an autotactic phenomenon of pattern formation produced by motile free‐swimming cells in a dense culture. This pattern of cell aggregation is remarkably similar to the Bénard‐cell patterns of classical physical chemistry, and reminiscent of the streaming patterns of motile microorganisms.In a study of light effects on the rate of pattern formation, we found that it has an endogenous circadian component, and is strongly dependent on cell concentration.
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