EDITORIAL NOTE vii ILLUSTRATIONS xi CHAPTER I HARVEY'S ATTITUDE TOWARD THE QUESTION OF THE USE OF THE CIRCULATION 1 CHAPTER II THE CIRCULATION AND THE FEEDING OF THE TISSUES 7 CHAPTER III RESPIRATION AND THE CIRCULATION 11 CHAPTER IV THE CIRCULATION AND THE ARISTOTELIAN PRIMACY OF THE HEART 42 CHAPTER V PHYSICIANS _versus_ PHILOSOPHERS--HARVEY FOR THE PHILOSOPHERS 55 CHAPTER VI THE CIRCULATION AND THE PRIMACY OF THE BLOOD 64 CHAPTER VII THE CAUSE OF THE HEART-BEAT 79 CHAPTER VIII HARVEY'S DELINEATION OF THE VENOUS RETURN 95 CHAPTER IX THE BLOOD THE SEAT OF THE SOUL 103 CHAPTER X THE BLOOD THE INNATE HEAT 116 CHAPTER XI THE INNATE HEAT NOT DERIVED FROM ELEMENTAL FIRE 139 CHAPTER XII THE CIRCULATION OF THE BLOOD AND THE CIRCULATION OF THE HEAVENS 154 NOTES 159 INDEX 191 ILLUSTRATIONS Portrait of William Harvey by Cornelius Jonson _Frontispiece_ FACING PAGE The Anatomical Theater at Padua 2 Page 80, right, of Harvey's _Prelectiones_, with transcript 42 The Title-page of the _Editio Princeps_ of Harvey's _De Motu Cordis_ 96 HARVEY'S VIEWS ON THE USE OF THE CIRCULATION OF THE BLOOD CHAPTER I HARVEY'S ATTITUDE TOWARD THE QUESTION OF THE USE OF THE CIRCULATION