PREFACE.
To republish a book after a lapse of thirty-six years can only be excused by the fact that it has long been out of print and that it is still asked for. When a new edition was proposed to me, my first intention was to issue the book as it stood, with no more change than the correction of obvious mistakes. But further consideration showed me that a good deal more than this was necessary if it was to be republished at all. Such revision, however, as I have made has been designedly made with a sparing hand, and the book remains in substance and in most details a work not of 1920 but of 1884. Had I written it now, the point of view would not have been quite the same. A large literature on the subjects I dealt with has appeared in the interval, and a fresh examination of the materials would certainly have recommended a different selection of 'illustrations' from that which I made then. It was indeed fortunate that I gave the book the title of Illustrations, because it made no claim to be a coherent history, though it has sometimes been mistaken for one.
The long interval of time which separates the new edition from the original seems to justify some statement as to the manner in which the essays collected in the book came to be written. In 1881 I resigned a post which I held in the department of manuscripts in the British Museum in order to spend two years in study on the Continent. This plan was made feasible by my election to a travelling scholarship on the Hibbert foundation, and I cannot too heartily express my
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