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Show , (progress of a Century x. i -"-ii " i PESTILENCE AND PL AG Ui WERE CONSTANT VISITORS IN ALl THEIR GHASTLY FORMS IN THE DAYS OF OUR GRANDFATHERS. GRAND-FATHERS. WHOLE COMMUNITIES . OFTEN WERE STRICKEN AND ALMOST WIPED OUT BY THESE GRIM SPECTRES. AMON6 MANKIND'S GREATEST BENEFACTORS WERE THE MEM WHO BRAVELY FOUGHT AND CONQUERED THESE DEADLY PLAGUES. i a JENHER DEMONSTRATED THE ! EFFICACY OF SMALLPOX VACCINATION IN 1796- j PASTEUR'S WORK ON FERMENTATION FERMEN-TATION IN I8S7 WAS THE FOUNDATION OF MODERN ! BACTERIA CONTROL j LISTER REVOLUTIONIZED ' SURGICAL PRACTICE IN I8t? j BY INTRODUCING ASCEPTIC j SURGICAL METHODS. KOCH DISCOVERED THE BACILLUS TUBERCULOSIS IN IS8Z AND IN (884 LOCATED THE COMMA BACIL- LUS WHICH CAUSES CHOLERA. j LOEFFLER DISCOVERED THE ) DIPTHERIA GERM IN I8&4. IN 1901 THE BRAVE G0R6AS DEMONSTRATED ENVIRONMENTAL CONTROL OF YELLOW FEVEfL |