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In a previous paper (Powell & Strange, 1953) the isolation of non-dialysable peptides containing hexosamine from exudates produced by germinating spores ofBacillus 8ubtilis and B. megatherium was described. More precise chemical definition can now be given to these peptides. In the following report, a comparison is made between their constitution and that ofthe peptides present in extracts from disintegrated resting spores, and from vegetative cells. A strain of B. cereu.s isolated from air is also included in the investigation.

Hexosamine-containing peptides in spores of Bacillus subtilis, B. megatherium and B. cereus