Practice question

The original edition of Bergey's Manual of Systematic Bacteriology published between 1984 and 1989 was organized into four comprehensive volumes reflecting classical phenotypic division. Volume 1 treated Gram-negative bacteria of general, medical, and industrial importance, Volume 2 covered Gram-positive bacteria, Volume 3 encompassed remaining Gram-negative, cyanobacteria and archaeobacteria, and Volume 4 included actinomycetes, spirochetes, and wall-deficient groups. This four-volume scheme preceded the molecularly reorganized five-volume second edition, mirroring expanding knowledge of prokaryotic diversity driven by 16S rRNA phylogeny and genomic analysis.