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In the period here under consideration, which was that of Freud's most voluminous production, he wrote some seventy-five papers, essays, books and prefaces. On the whole they are characterized by detailed working out of the fundamental theories he had already put forward rather than by the novel discoveries of the earlier period and the philosophical vision of the final one. The Libido theory is amplified to its fullest extent and its applications explored in diverse fields. The clinical contributions are of outstanding importance. But Freud was already reaching beyond the clinical sphere and making studies in the fields of religion, aesthetics, pre-history and pure psychology. In a review of the total output perhaps the outstanding contributions are the long case histories and the books on the Theory of Sexuality and on Totemism.
It has seemed conducive to an easier appreciation of this vast production to group the items into seven chapters according to their main theme, the contents being then considered chronologically. It is of course inevitable that there is a little overlapping in such a classification, since a given paper may be concerned with more than one theme.