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SUMMARY: Thirty strains of Bacillus polymyxa were isolated from soil, vegetation and water, and nine strains were received from other sources. At the time of isolation the new strains were of a white or sporogenous colony type, but rapidly produced asporogenous and rough variants. Four bacteriophages were isolated from a variant of a soil strain and from soil and sewage. These differed in host-strain specificity, particle size, heat resistance, citrate sensitivity and serological reactions.Following the report by Ainsworth, Brown & Brownlee (1947) of an antibiotic-'Aerosporin '-produced by Bacillus aerosporus (Greer), work was undertaken on certain aspects of the bacteriology of this organism.

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