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It is suggested that there are at least two types of E. coli; one-of which a perfect description is given by Kofoid under the name of Councilmania-characterized by possessing clear blade-like pseudopodia, well differentiated from the endoplasm, occasionally of exceptional motility, which may be retained even after prolonged centrifugation in cold tap water in the process of concentration. This type seems to have a tendency to the formation of irregularly contoured, thick-walled cysts. Such cysts as these are easily fractured by immersion in a hot mercurial solution such as Schaudinn.
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Thomas N. Wight (1925) studied this question.