It is still possible in the eastern United States to distinguish the initial occupance patterns established by migrants from the seaboard source areas. Among the occupance ingredients, housing of all kinds is the most reliably diagnostic of the whole; however, the course of development from each of the source areas followed quite different lines. From New England's evolutionary series of house types was carried by migrating groups the house contemporaneously fashionable, whereas the barn remained unchanged. For the Upland South the English “I” house was the one idealized type marking economic attainment; the German log barn evolved into quite different forms. For the Tidewater South there was an evolutionary series beginning with the frame, single-room, end-chimney English cottage and culminating in the raised house with front porch and rear appendage. Westward migration found natural conditions much like those of the seaboard; southward movement carried from continental to subtropical conditions, reflected especially in changing form and function of barns.