Produced by The Online Distributed Proofreading Team at http://www.pgdp.net (This file was produced from images generously made available by The Internet Archive.) The chapters composing this book appeared originally in the shape of review articles. I owe acknowledgments to the Editors of _Blackwood's Magazine_, the _National Review_ and the _Gentleman's Magazine_ for the permission kindly accorded me to republish them.…
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