EVIDENCE is rapidly accumulating which indicates that gas liquid chromatography (GLC) is a useful aid in the identification and classification of microorganisms (Abel, de Schmertzing, and Peterson, 1963; Reiner, 1965; Henis, Gould, and Alexander, 1966). Recently, several workers have analysed microorganisms for fatty acids by GLC and, by comparing their profiles, have established some useful taxonomic relationships (Moss and Lewis, 1967; Yamakawa and Ueta, 1964). The present study describes the fatty acid composition of fifteen different cultivable treponemes. Material and methods The following cultures were obtained, both as lyophilized and as freshly cultivated treponemes, from the Venereal

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