PUBLISHERS' PREFACE.

Mr Mitchel's Preface not having yet arrived from America, we shall be obliged to issue it with Vol. 2, or supply it by itself, as we may consider best.

We have left out, at Mr Mitchel's request, an incorrect Index, which is published in other Editions. Mr Mitchel says in his letter to us-"I beg you to omit the Index at the end, which was prepared by some printer, and is a blemish to the book. The table of contents and headings of chapters, prepared by myself, are the best and only Index."