In treating so very wide a field, it has been felt that the chief prominence should be given to that great sequence of architectural styles which form the links of a chain connecting the architecture of modern Europe with the earliest specimens of the art. Egypt, Assyria, and Persia combined to furnish the foundation upon which the splendid architecture of the Greeks was based. Roman architecture was founded on Greek models with the addition of Etruscan construction, and was for a time universally prevalent. The break-up of the Roman Empire was followed by the appearance of the Basilican, the Byzantine, and the Romanesque phases of Christian art; and, later on, by the Saracenic. These are the styles on which all mediæval and modern European architecture has been based, and these accordingly have furnished the subjects to which the reader's attention is chiefly directed. Such styles as those of India, China and Japan, which lie quite outside this series, are noticed much more briefly; and some matters--such, for example, as prehistoric architecture--which in a larger treatise it would have been desirable to include, have been entirely left out for want of room. In treating each style the object has not been to mention every phase of its development, still less every building, but rather to describe the more prominent buildings with some approach to completeness. It is true that much is left unnoticed, for which the student who wishes to pursue the subject further will have to refer to the writings specially devoted to the period or country. But it has been possible to describe a considerable number of typical examples, and to do so in such a manner as, it is hoped, may make some impression on the reader's mind. Had notices of a much greater number of buildings been compressed into the same space, each must have been so condensed that the volume, though useful as a catalogue for reference, would have, in all probability, become uninteresting, and consequently unserviceable to the class of readers for whom it is intended. As far as possible mere matters of opinion have been excluded from this handbook. A few of the topics which it has been necessary to approach are subjects on which high authorities still more or less disagree, and it has been impossible to avoid these in every instance; but, as far as practicable, controverted points have been left untouched. Controversy is unsuited to the province of such a manual as this, in which it is quite sufficient for the authors to deal with the ascertained facts of the history which they have to unfold.