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It is a pleasure further to acknowledge the ever ready aid he has received from his personal friends — from Dr. A. S. Way, who has not only contributed the verse-translations throughout the treatise but has given help of unusual range and worth in other directions also, and from Mr. L. H. G. Greenwood, Mr. G. B. Mathews, Mr. P. N. Ure, and Professor T. Hudson Williams, who have read the proofs and made most valuable suggestions. Nor should the great care shown in the printing of the book by M essrs. R, db R, Clark's able staj' of compositors and readers be passed over without a word of grateful mention.
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