Frontmatter -- ACKNOWLEDGEMENTS -- CONTENTS -- I. INTRODUCTION -- II. PHYSIOLOGICAL CONSIDERATIONS -- III. On the Definition of the Formants -- IV. On Webster's Horn Equation -- V. The General Circuit Parameters and the Formants of the Exponential Horn -- VI. The Method of the Loss-Free Twin-Tube Resonator -- VII. Vector Representation of the Twin-Tube Formants -- VIII. Stationary Wave-Patterns in the Twin-Tube Resonator -- IX. The Vowel Triangle as a Limiting Contour of the Formants of the Vocal Tract -- X. Application of the Twin-Tube Method to the Vowel System of Dutch -- XI. The Formants of Resonators Containing Exponential Horns -- XII. The Twin-Tube Resonator with Front Diabolo as a Model for the Formants of Monolithic Diphthongs and Vowels in Running Speech -- XIII. Appendix -- INDEX