This thesis is a phonetic and phonolological study of the verbal piece in the Yatta dialect. It consists of three main parts. Part One, which involves Chapters 1-3, handles the grammatical framework in terms of which this phonetic and phonological study is presented. Chapter I treats the grammatical categories in terms of which the verbal piece is defined. Chapters 2 and 3 deal with the classification of the various patterns of the verb in the Y. D. Part Two (Chapters 4-9) deals with the phonological elements of structure and their phonetic exponents. The phonetic description, based on the writer's feeling as a native speaker of the language, is supported by experimental evidence and the whole experimental description is involved in this part. The experimental data, however, is presented in a separate volume. Part Three (Chapters 10-20) which forms the bulk of this thesis deals in elaborate detail with=the phonological structures of the verbal piece within the framework of affixes (Chapter 10) and stem (Chapter 11-2--0) of the 10 3R and the 2 4R Patterns of the verb in terms of the phonological elements of structure set up and handled in detail in Part Two.