"First will come the inquiry why a town ever gathered together at all at that particular spot - what induced the aggregation of human beings rather there then elsewhere. Next. we shall consider why that town grew to social or political importance and what were the stages by which it assumed its present shape. Thirdly, we shall ask why it gave rise to that higher form of handicraft which we know as Art, and towards what particular arts it especially gravitated. After that, we shall take in detail the various strata of its growth or development, examining the buildings and works of art which they contain in historical order, and, as far as possible, tracing the causes which led to their evolution. In particular, we shall lay stress upon the origin and meaning of each structure as an organic whole, and upon the allusions of symbols which its fabric embodies."