AN account was given in a previous communication [Cooper and Preston, 1935] of the study of the biochemical conditions influencing the formation and activity of diastase and invertase in bacteria, and also of the synthesising enzyme associated with the formation of polysaccharides of the "laevan" type by bacterial action.It was suggested in that paper that the investigations would be of wider physiological interest if they could be extended to the formation of other polysaccharides such as dextrans, galactans, pentosans, in addition to laevans.Experiments in this direction were commenced with numerous microorganisms, but in the case of the aerobic sporing bacilli and the plant-pathogenic bacteria their synthetic capacity was limited to "laevan formation".Further investigations with other micro-organisms have now been carried out and are described in the present paper.The general experimental methods and basal culture media employed were the same as those used in the previous work, the principal culture medium being a solution of % Peptone 0-1 Na2HPO4, 12H20
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Carruthers et al. (1936) studied this question.