Abstract
The progeny of a single cell of Brucella abortus isolated from a heterogeneous population exhibited similar dissocn. rates. The progeny of diff. single cells from the same population showed varying dissocn. rates. All types of variants arose among the progeny of a single cell. Substrates thus established and kept on agar slants at low temps. have so far kept their original dissocn. rates for > 6 mos. The degree of dissocn. depended upon population density and pH. The type of dissocn. and the ability to withstand toxic effects differed between clones.

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