This edition of Professor Knaysi's monograph, the first edition of which appeared in 1944, has been greatly expanded and revised to include new knowledge resulting from the current revival of activity in the cytology of microorganisms. The book can be recommended as indispensable background and reference reading for the serious and discriminating student of the subject, whether he be a mature investigator or graduate student.
Professor Knaysi's book is not clinically oriented. For the medical reader seeking orientation in microbiology, this treatise is recommended only with reservations arising from the following considerations. Biochemically the basic similarities of all living organisms, including bacteria, are well established. Recognition of fundamental biochemical processes common both to microorganisms and to the cells of higher organisms is proving exceedingly fruitful in that it permits analysis, through more experimentally controllable populations of microorganisms, of processes that can be verified as occurring in the metabolism of the