 This 'doctrine' found its fullest expression in Frye's appropriately named "The Great Code", which he described as "a preliminary investigation of Biblical structure and typology" whose purpose was ultimately to suggest "how the structure of the Bible, as revealed by its narrative and imagery, was related to the conventions and genres of Western literature" ("Words with Power" xi).During the 1950s, Frye wrote annual surveys of Canadian poetry for the "University of Toronto Quarterly", which led him to observe recurrent themes and preoccupations in Canadian poetry.Subsequently, Frye elaborated on these observations, especially in his conclusion to Carl F. Klinck's "Literary History of Canada" (1965).