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is now nearly fifty years since I first projected a system of verbal classification similar to that on which the present Work is founded. Conceiving that such a compilation might help to supply my own deficiencies, I had, in the year 1805, completed a classed catalogue of words on a small scale, but on the same principle, and nearly in the same form, as the Thesaurus now published. I had often, during that long interval, found this little collection, scanty and imperfect as it was, of much use to me in literary composition, and often contemplated its extension and improvement; but a sense of the magnitude of the task, amidst a multitude of other avocations, deterred me from the attempt. Since my retirement from the duties of Secretary of the Royal Society, however, finding myself possessed of more leisure, and believing that a repertory of which I had myself experienced the advantage might, when amplified, prove useful to others, I resolved to embark in an undertaking, which, for the last three or four years, has given me incessant occupation, and has, indeed, imposed upon me an amount of labour very much greater than I had anticipated. Notwithstanding all the pains I have bestowed on its execution, I am fully aware of its numerous deficiencies and imperfections, and of its falling far short of the degree of excellence that might be attained. But, in a Work of this nature, where perfection is placed at so great a distance, I have thought it best to limit my ambition to that moderate share of merit which it may claim in its present form; trusting to the indulgence of those for whose benefit it is intended, and to the candour of critics, who, while they find it easy to detect faults, can at the same time duly appreciate difficulties. 18, Upper Bedford Place, London:


 * April 29th, 1852.