In preparing my translation I have had the advantage of the co-operation of Mr. James Speirs, until his sudden and untimely death, and the invaluable assistance of my friend, Dr. T. Miller Neatby, m.a., who has constantly criticized the work both as physician and as writer, giving a value to this version which it would otherwise have lacked. To him I render my most hearty and grateful thanks: indeed, I am deeply conscious that his aid will count for no small proportion of any acceptance which this volume may win.
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