Sir,--My attention has been particularly engaged by one suggestion in your Prospectus, because it seems to hold out a hope that your intended work will furnish what has long been a _desideratum_ in literature. We really do want something that may form a "supplement to works already in existence--a treasury for enriching future editions of them;" while it may also receive (as I have no doubt you meant to include,) such contributions of moderate extent, as may tend to render fuller and more correct some works which have little or no chance of future editions. In this way you may be of great use in every department of literature; and especially in works of reference. With them, indeed, correctness is everything; perfect accuracy is not to be attained, and the nearest possible approximation to it can be made only by many little careful steps, backwards as well as forwards. By works of reference, however, I do not mean Dictionaries, though I would include them, as a class of works for which I have a singular respect, and to which my remark particularly applies. There are many other books, and some which very properly aspire to the tile of History, which are, in fact and practically, books of reference, and of little value if they have not the completeness and accuracy which should characterise that class of works. Now it frequently happens to people whose reading is at all discursive, that they incidentally fall upon small matters of correction or criticism, which are of little value to themselves, but would be very useful to those who are otherwise engaged, if they knew of their existence.