This volume is a polemic against confining the study of bacteria solely to their physiological properties. The author considers them as living cells with the same structure and functions as other living cells. The limitations of past and present technics for the study of bacterial morphology are emphasized, and new methods are proposed. These include special staining technics for the demnostration of the various components of the bacterium, including nuclei and chromosomes. Also included are discussions of reproduction, sexuality, life cycles and genetics of bacteria. A minimum of proof of structure is established by the author; the problems remain unsolved. The book will be of interest only to microbiologists, geneticists and cytologists who are interested in cell structure and cell metabolism.