This thesis discusses the stylistic development of Lionel LeMoine FitzGerald (1890-1956) as seen in his dated oil paintings. Chapter I outlines FitzGerald's formative years (1890-1919). It attempts to explain how his love of the prairies and interest in art developed. It suggests the dominant influences in his study of art. It includes a stylistic discussion of FitzGerald's earliest works, including his well known, Late Fall, Manitoba (1918). Chapter II attempts to explain why FitzGerald suddenly lightened and brightened his palette. It explores the sources which may have influenced the development of FitzGerald's impressionistic style (1920-October 1921) and it provides a stylistic analysis of two of his impressionistic works, Summer Eas...