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PREFACE.
xi
written, with, here and there, correction of a phrase, and omission of one or two passages of merely personal or temporary interest; the headings only are added, in order to give the reader some clue to the general aim of necessarily desultory discussion; and the portions of Mr. Dixon's letters in reply, referred to in the text, are added in the Appendix, and will be found well deserving of attention.
Denmark Hill,
December 14, 1867.
