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On this occasion I avail myself with pleasure of permission to express my thanks by name to Miss Kate A. Helliwell, the gifted and generous friend to whom again I have been indebted for invaluable assistance in revising my work for press. And in conclusion I would repeat the request that those of my readers in a position to detect any of the defects of this volume would oblige me, and ultimately the public, with their criticisms and suggestions. Letters may be addressed to the care of the London publishers.
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