Race--Insanity--The influence of sex--The heredity of genius--Criminal and insane parentage and descent of genius--Age of parents--Conception. CHAPTER IV. THE INFLUENCE OF DISEASE ON GENIUS.....151-152 Spinal diseases--Fevers--Injuries to the head and their relation to genius. CHAPTER V. THE INFLUENCE OF CIVILIZATION AND OF OPPORTUNITY.....153-160 Large Towns--Large Schools--Accidents--Misery--Power--Education. PART III. _GENIUS IN THE INSANE._ CHAPTER I. INSANE GENIUS IN LITERATURE.....161-178 Periodicals published in lunatic asylums--Synthesis--Passion--Atavism--Conclusion. CHAPTER II. ART IN THE INSANE.....179-208 Geographical distribution--Profession--Influence of the special form of alienation--Originality--Eccentricity--Symbolism --Obscenity--Criminality and moral insanity--Uselessness--Insanity as a subject--Absurdity--Uniformity--Summary--Music among the insane. CHAPTER III. LITERARY AND ARTISTIC MATTOIDS.....209-241 Definition--Physical and psychical characteristics--Their literary activity--Examples--Lawsuit mania--Mattoids of genius--Bosisio--The _décadent_ poets--Verlaine--Mattoids in art. CHAPTER IV. POLITICAL AND RELIGIOUS LUNATICS AND MATTOIDS.....242-313 Part played by the insane in the progressive movements of humanity--Examples--Probable causes--Religious epidemics of the Middle Ages--Francis of Assisi--Luther--Savonarola--Cola da Rienzi --San Juan de Dios--Campanella--Prosper Enfantin--Lazzaretti --Passanante--Guiteau--South Americans. PART IV. _SYNTHESIS. THE DEGENERATIVE PSYCHOSIS OF GENIUS._ CHAPTER I. CHARACTERISTICS OF INSANE MEN OF GENIUS.....314-329 Characterlessness--Vanity--Precocity--Alcoholism--Vagabondage-- Versatility--Originality--Style--Religious doubts--Sexual abnormalities--Egoism--Eccentricity--Inspiration. CHAPTER II. ANALOGY OF SANE TO INSANE GENIUS.....330-335 Want of character--Pride--Precocity--Alcoholism--Degenerative signs--Obsession--Men of genius in revolutions. CHAPTER III. THE EPILEPTOID NATURE OF GENIUS.....336-352 Etiology--Symptoms--Confessions of men of genius--The life of a great epileptic--Napoleon--Saint Paul--The saints--Philanthropic hysteria. CHAPTER IV. SANE MEN OF GENIUS.....353-358 Their unperceived defects--Richelieu--Sesostris--Foscolo--Michelangelo--Darwin. CHAPTER V. CONCLUSIONS.....359-361 APPENDIX.....363-366 INDEX.....367-370 THE MAN OF GENIUS. PART I. _THE CHARACTERISTICS OF GENIUS._ CHAPTER I. HISTORY OF THE PROBLEM. Aristotle--Plato--Democritus--Felix Plater--Pascal--Diderot--Modern writers on genius.