AEROBIC SPOREFORMING BACTERIA CAPABLE OF GROWTH AT HIGH TEMPERATURES

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Abstract
A collection of 216 cultures was assembled for a taxonomic study of the aerobic spore-forming bacteria capable of growth at high temps. 33 named strains were obtained, the remainder being unnamed isolations. 39% of the isolations and one of the named cultures were found to.be strains of Bacillus subtilis, B. circulans, or other spp. with even lower temp. limits of growth. The rest of the cultures fell into 2 distinct groups, Of which B. stearothermophilus and B. coagulans are representatives. Emended descriptions of these 2 spp. are given. Maximum temp. of growth was found to vary widely among the strains of individual spp. and cannot be used as a dividing character among spp.