_THE present edition is no drastic revision of the original one. Only a paragraph or two has been omitted or rewritten, and the one wholly new section is the Epilogue. However, very many corrections and additions have been made in detail, following suggestions made by reviewers and including facts supplied by others, notably John Jacobus, Robin Middleton, Pieter Singelenberg, John Harris, Fritz Novotny, Malcolm Quantrill, Carroll Meeks, and Kevin Dynan among a host of correspondents who have kindly answered specific queries or volunteered relevant information. No changes have been made in the Figures and only about a dozen in the Plates, chiefly at the end where it was possible to introduce the influential work of Aalto and characteristic examples of late Japanese work by reducing the Latin-American representation, not to speak of important works by Wright, Le Corbusier, and Mies completed since the original edition was prepared. The sources of the new photographs are indicated in the List of Plates, but I must specially thank Messrs Hentrich and Johnson, among the architects, for their assistance and also J. M. Richards of the_ Architectural Review _from whose files come the Japanese material and one of the Aalto illustrations_. _A certain number of new Notes (indicated by a letter after the number) have been added and many were largely rewritten. The Bibliography has been extended to include titles posterior to the date of the original edition._ _H. R. H._ _1962_ ------------------------------------------------------------------------ INTRODUCTION THE round numbers of chronology have no necessary significance historically. Centuries as cultural entities often begin and end decades before or after the hundred-year mark. The years around 1800, however, do provide a significant break in the history of architecture, not so much because of any major shift in style at that precise point as because the Napoleonic Wars caused a general hiatus in building production. The last major European style, the Baroque, had been all but dissolved away in most of Europe. The beginnings of several differing kinds of reaction against it—Academic in Italy, Rococo in France, Palladian in England—go back as far as the first quarter of the century; shortly after the mid century there came a more concerted stylistic revolution.