Habitations affected by environment 473 Rectangular forms developed from circular 475 Flat and terraced roofs developed from sloping mesa-sites 477 Added stories developed from limitations of cliff-house sites 479 Communal pueblos developed from congregation of cliff-house tribes 480 Pottery affected by environment 482 Anticipated by basketry 483 Suggested by clay-lined basketry 485 Influenced by local minerals 493 Influenced by materials and methods used in burning 495