INTRODUCTION NOTE ON THE SOURCES I THE MILESIAN SCHOOL II SCIENCE AND RELIGION III HERAKLEITOS OF EPHESOS IV PARMENES OF ELEA V EMPEDOKLES OF AKRAGAS VI ANAXAGORAS OF KLAZOMENAI VII THE PYTHAGOREANS VIII THE YOUNGER ELEATICS IX LEUKIPPOS OP MILETOS X ECLECTICSM AND REACTION APPENDIX NEX