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p. viiPREFACE It is with some hesitation that I give my husband’s last book to the world.  It was in type when he died, but he had no time to correct even the first proofs, and doubtless he would have made many changes, if not in his views at least in his expression of them.  Mr. Bartram has verified the quotations and dates with infinite care, and for this he has my warmest thanks.  For the rest I can but ask those who differ from the author to remember the circumstances in which the