Antibiotics; Origin, Nature and Properties, Volume II focuses on the principles of the classification of antibiotic substances. This volume is divided into four main topics—antibiotics produced by Fungi imperfecti, antibiotics produced by fungi belonging to the basidiomycetes and ascomycetes, antibiotics produced by lichens and algae, and antibiotics from higher plants. The antibiotics covered in this book include penicillin, viridicatin, cyclopaldic acid, cephalosporin P, bongkrek acid, chlamydosporine, and flammulin. The diploicin, chlorellin, chlorophorin, ethyl gallate, anacardic acid, and echinacosid are also described. Other antibiotics include the tuberosine, antifungal substance from field corn, fulvoplumerin, plumericin, and chinoc acid. This publication is recommended for pharmacists and specialists interested in the classification of antibiotics.