Notwithstanding this paucity of new material, the completion of M. Place’s great work on Khorsabad, Wood’s explorations at Ephesus, Dr. Tristram’s travels in Moab, with other minor works, and new photographs of other places, have furnished some twenty or thirty woodcuts to this work, either of new examples or in substitution for less perfect illustrations. More than this, the experience gained in the interval from reading, and personal familiarity with buildings not before visited, especially in Italy, have enabled me to add considerably to the text and to correct or modify impressions based on less perfect information. These, with a careful revision of the text throughout, will, it is hoped, be found to render this edition an improvement to a considerable extent over that which preceded it. As mentioned in the preface to the volume containing the History of the Modern Styles of Architecture, the scheme of the present edition is that the two volumes now published shall contain a description of all the ancient styles of architecture known to exist either in the Old or New world, except India. In the first edition the Indian styles occupied about 300 pages, and were illustrated by 200 woodcuts. In the present one it is proposed to double the extent of the text and to add such further illustrations as may be found requisite fully to illustrate the subject. When this is done it will form a separate volume, either the third of the general History of Architecture, or a complete and independent work by itself, and sold separately. If nothing unforeseen occurs to prevent it, it is expected that the work will be published before the end of next year (1875). The History of the Modern Styles of Architecture, published last year, will then form the fourth and concluding volume of the work, or may be considered as a complete and independent treatise, and, like the volume containing the History of Indian Architecture, will be sold separately. As stated in the preface to the first edition, it was originally intended that chapters should be added on what were then known as Celtic or Druidical remains. When, however, the subject came to be carefully looked into for that purpose, it was found that the whole was such a confused mass of conflicting theories and dreams, that no facts or dates were so established that they could be treated as historical. The consequence was that the materials collected for the purpose were, in 1872, published in a separate volume, entitled ‘Rude Stone Monuments,’ in the form rather of an argument than of a history.