Frontmatter -- ACKNOWLEDGEMENTS -- PREFACE -- TABLE OF CONTENTS -- LIST OF TABLES -- I. Introduction -- II. Interference as Defined by Linguistic Science -- III. Interference as Defined by Psychology of Learning -- IV. The T System Phonemic Inventory -- V. AE Phonemic Inventory -- VI. Contrastive Analysis of AE/T Systems -- VII. Experimental Method -- VIII. Results -- IX. Summary -- Appendix I. Total Number of Correct Learning Trials per Subject per Category -- Appendix II. Total Number of Correct Testing Trials per Subject per Category -- Appendix III. Spectrogram Comparison of /h/, /?/, /x/ and AE/h/ -- Appendix IV. Learning Curves /h/, /?/, /x/, /?/,/t/, /?/ -- Appendix V. Learning Curves /ey/, /?/ and /??/, /e/ -- Appendix VI. Learning Curves /ï/, /ü/ and /ž/, /?/ -- References Cited