The second and less important group of authorities with which I have busied myself during the work of revision comprises the works of Hüffer, Vivenot, Beer, Helfert, and others, based on Austrian documents, along with the Austrian documents and letters that have been published by Vivenot. The last-named writer is himself a partizan, but the material which he has given to the world is most valuable. The mystery in which the Austrian Government until lately enveloped all its actions caused some of these to be described as worse than they really were; and I believe that in the First Edition I under-estimated the bias of Prussian and North-German writers. Where I have seen reasons to alter any statements, I have done so without reserve, as it appears to me childish for any one who attempts to write history to cling to an opinion after the balance of evidence seems to be against it. The publication of the second volume of this work has been delayed by the revision of the first; but I hope that it will appear before many months more. I must express my obligations to Mr. Oscar Browning, a fellow-labourer in the same field, who not only furnished me with various corrections, but placed his own lectures at my disposal; and to Mr. Alfred Kingston, whose unfailing kindness and courtesy make so great a difference to those whose work lies in the department of the Record Office which is under his care. London, 1883. PREFACE TO THE SECOND VOLUME. [2] In writing this volume I have not had the advantage of consulting the English Foreign Office Records for a later period than the end of 1815. A rule not found necessary at Berlin and some other foreign capitals still closes to historical inquirers the English documents of the last seventy years. Restrictions are no doubt necessary in the case of transactions of recent date, but the period of seventy years is surely unnecessarily long. Public interests could not be prejudiced, nor could individuals be even remotely affected, by the freest examination of the papers of 1820 or 1830.