In concluding the list of those to whose good offices I have been indebted, I must not omit the names of M. de Salvandy, minister of public instruction in France at the time I was engaged in making my collection; Mr. Rush, then the minister of the United States at the French court; Mr. Rives, of Virginia, his successor in that office; and last, not least, my friend, Count de Circourt, a scholar whose noble contributions to the periodical literature of his country, on the greatest variety of topics, have given him a prominent place among the writers of our time. I am happy, also, to tender my acknowledgments for the favors I have received from Mr. Van de Weyer, minister from Belgium to the court of St. James; from Mr. B. Homer Dixon, consul for the Netherlands at Boston; and from my friend and kinsman, Mr. Thomas Hickling, consul for the United States at St. Michael's, who kindly furnished me with sundry manuscripts exhibiting the condition of the Azores at the period when those islands passed, with Portugal, under the sceptre of Philip the Second. Having thus acquainted the reader with the sources whence I have derived my materials, I must now say a few words in regard to the conduct of my narrative. An obvious difficulty in the path of the historian of this period arises from the nature of the subject, embracing, as it does, such a variety of independent, not to say incongruous topics, that it is no easy matter to preserve anything like unity of interest in the story. Thus the Revolution of the Netherlands, although, strictly speaking, only an episode to the main body of the narrative, from its importance, well deserves to be treated in a separate and independent narrative by itself.[1] Running along through the whole extent of Philip's reign, it is continually distracting the attention of the historian, creating an embarrassment something like that which arises from what is termed a double plot in the drama. The best way of obviating this is to keep in view the dominant principle which controlled all the movements of the complicated machinery, so to speak, and impressed on them a unity of action. This principle is to be found in the policy of Philip, the great aim of which was to uphold the supremacy of the Church, and, as a consequence, that of the crown. "Peace and public order," he writes on one occasion, "are to be maintained in my dominions only by maintaining the authority of the Holy See." It was this policy, almost as sure and steady in its operation as the laws of Nature herself, that may be said to have directed the march of events through the whole of his long reign; and it is only by keeping this constantly in view that the student will be enabled to obtain a clew to guide him through the intricate passages in the history of Philip, and the best means of solving what would otherwise remain enigmatical in his conduct.