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and the Online Distributed Proofreading Team. THE STORY OF GERM LIFE BY H. W. CONN PROFESSOR OF BIOLOGY AT WESLEYAN UNIVERSITY, AUTHOR OF EVOLUTION OF TO-DAY, THE LIVING WORLD, ETC. PREFACE. Since the first edition of this book was published the popular idea of bacteria to which attention was drawn in the original preface has undergone considerable modification. Experimental medicine has added constantly to the list of diseases caused by bacterial organisms, and the genera