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The description of an organism termed Bacillus acetoethylicum which was isolated from old potatoes is given. The organism resembles in some ways the B. maceracns described by Schardinger (Centr. Bakt. Par., 1905, ii, 14, 772), but it is not thought that the two are identical. This organism produces acetone and ethyl alcohol from starch or sugar. The optimum conditions for the fermentation have been studied, and a semi-continuous method €or carrying on the process is described.doi:10.1039/ca9191600507 fatcat:b57qbdmlqfcsddv4dziycr7eky