ADVERTISEMENT. Portions of the following pages have already ap peared, in substance, in the columns of the Morning Herald, of the 1st, 14th, and 26th of December last. At the solicitation of friends feeling deep interest in the fate of the Franklin Expedition, the Author has been induced to cast the principal parts of these several communications, enlarged by a considerable quantity of fresh materials, into a separate publica tion. Whilst so doing, he has deemed it important, with the view of more completeness, and, it is hoped, of greater utility, to introduce the variety of new and additional matter—such, for instance, as Chapter IV., on the Middle-ice, a subject not hitherto to be found treated of in print,—which has enlarged his publication to its present extent. Having, however, carefully separated the various matters under different Chapters, so as to enable the reader to turn to any particular topic by itself, he trusts the increase in magnitude will not be found inconvenient for general reference. Athenaeum, London, Jan. 25, 1850.