The History of Bergey’s Manual -- On Using the Manual -- Procaryotic Domains -- Classification of Procaryotic Organisms and the Concept of Bacterial Speciation -- Identification of Procaryotes -- Numerical Taxonomy -- Polyphasic Taxonomy -- Overview: A Phylogenetic Backbone and Taxonomic Framework for Procaryotic Systematics -- Nucleic Acid Probes and Their Application in Environmental Microbiology -- Bacterial Nomenclature -- Etymology in Nomenclature of Procaryotes -- Microbial Ecology—New Directions, New Importance -- Culture Collections: An Essential Resource for Microbiology -- Intellectual Property of Procaryotes -- Anoxygenic Phototrophic Purple Bacteria -- Aerobic Bacteria Containing Bacteriochlorophyll And Belonging To The Alphaproteobacteria -- Nitrifying Bacteria -- The Lithoautotrophic Ammonia-Oxidizing Bacteria -- The Lithoautotrophic Nitrite-Oxidizing Bacteria -- Bacteria that Respire Oxyanions of Chlorine -- The Revised Road Map to the Manual.