=Duality of Man's Nature= I.--DUALITY OF VOICE DUALITY OF VOICE AN OUTLINE OF ORIGINAL RESEARCH BY EMIL SUTRO AUTHOR OF "THE BASIC LAW OF VOCAL UTTERANCE." G. P. PUTNAM'S SONS NEW YORK AND LONDON The Knickerbocker Press 1899 COPYRIGHT, 1899 BY EMIL SUTRO Entered at Stationers' Hall, London. The Knickerbocker Press, New York "There is nothing in our composition either purely material or purely spiritual."--MONTAIGNE. [Illustration] CONTENTS CHAPTER PAGE I.--INTRODUCTION 1 Comments of a Distant Reviewer 15 Fragments 22 Basic Law of Vocal Utterance 37 The Voice of the Œsophagus and its Vocal Cords 41 II.--THE HUMAN VOICE 44 Introspection 50 Making Parts Rigid 56 Extirpation 59 Movements of the Tongue 61 Simple Sounds 66 Posterior Surfaces 68 Inspiration--Expiration 77 Diaphragms 80 III.--IMPRESSION--EXPRESSION 83 The Phonograph 88 Stuttering--Stammering 92 Cathode of a Vocal Sound 103 IV.--OUR MOTHER TONGUE 110 National Traits of Character 112 The American Nation 120 Centripetal and Centrifugal 124 Rotation of Centripetal and Centrifugal Action 130 V.--NATIONALITY AND RACE DISTINCTIONS 137 Idiomatic Expression 141 Origin of Anglo-Saxon Race and Idiom. Origin of German Race and Idiom.