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That human fecesmay contain a variety of species of non-spore-bearing anaerobic bacilli has been known for some time. Tissier showed in 1900 that the predominating organism in the stools of breast-fed infants was a Gram-positive bacillus without spores and strictly anaerobic, to which he gave the name of Bacillus bifidus-communis. In 1908, Tissier described four other anaer-obes, also from infants ' stools: Coccobacillus preacutus, Cocco-bacillus oviformis, Bacillus ventriosus, and Bacillus capilosus. Then, in 1911 and 1912, Distaso reported nine new species of non-spore-bearing anaerobic bacilli from adult stools: Bacillus multiformis, Diplobacillus acuminatus, BaciLlus variabilis, Bacillus pseudoramosus, Bacillus bullosus, Bacillus thetaiotaomicron, Bacil-lus variegatus, Bacillus cornutus, and Bacillus tenuis-spatuliformis
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Eggerth et al. (1933) studied this question.
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