Abstract
Two soil organisms, Arthrobacter pascens and Arthrobacter terregens, the first producing a growth-promoting substance, the "terregens factor", and the second requiring it, pass through a complex morphological life cycle. Two kinds of aged cells are found of which, on transfer to fresh medium, one forms a cystite which 'germinates' and looses free cells from a ruptured tube, the other follows the usual course of 'normal' cell division. The similarity in form to that of the type species Arthrobacter globiforme is quite distinct.

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