The author''s purpose is to set out as simply and vividly as possible the exact grammatical workings of an architectural language.Classical architecture is a visual "language" and like any other language has its own grammatical rules. Classical buildings as widely spaced in time as a Roman temple, an Italian Renaissance palace and a Regency house all show an awareness of these rules even if they vary them, break them or poetically contradict them.Sir Christopher Wren described them as the "Latin" of architecture and the analogy is almost exact. There is the difference, however, that whereas the learning of Latin is a slow and difficult business, the language of classical architecture is relatively simple. It is still, to a great extent, the mode of expression of our urban surroundings, since classical architecture was the common language of the western world till comparatively recent times.Anybody to whom architecture makes a strong appeal has probably already discovered something of i