However, certain kinds of sgraffito ware continued to be made without apparent interruption until early in the present century. Instead of useful tableware, decorated with symbols and motifs characteristic of 17th-century English folk ornament, we find after 1700 only presentation pieces, particularly in the form of large harvest jugs. The harvest jugs were made for annual harvest celebrations, when they were passed around by the farmers among their field hands in a folk ritual observed at the end of harvest.[54] Unlike the sgraffito tablewares, where style and taste were deciding factors in their survival, these special jugs were intended to be used only in annual ceremonies. Thus they were carefully preserved and passed on from generation to generation, with a higher chance for survival than that which the sgraffito tablewares enjoyed. The style of the harvest jugs is in sharp contrast to that of the tablewares, the jugs having been decorated in a pagan profusion of fertility and prosperity symbols, mixed sometimes with pictorial and inscriptive allusions to the sea, particularly on jugs ascribed to Bideford. The oldest dated examples embody characteristics of design and techniques that relate them unmistakably to the tablewares, while later specimens made throughout the 18th and 19th centuries show an increasing divergence from the 17th-century style. An especially elaborate piece was made for display at the Great Exhibition of 1851 in the Crystal Palace.[55] Less complicated pieces, with a minimum of incising, were made for ordinary use, as were plain pieces whose surfaces were covered with slip without decoration. The trailing and splashing of slip designs on the body of the ware, practiced in Staffordshire and many of our colonial potteries, apparently was not followed in North Devon.[56] Sites Yielding North Devon Types Excepting the Bowne House oven and a 1698 jug (see p. 45), no example of North Devon pottery used in America is known to have survived above ground. Archeological evidence, however, provides a sufficient record of North Devon wares and the tastes and customs they reflected. Following are descriptions of the principal sites in which these wares were found. JAMESTOWN, VIRGINIA: MAY-HARTWELL SITE. The site of Jamestown, first permanent English settlement in North America, has been excavated at intervals by the National Park Service. The early excavations were under the supervision of several archeological technicians directing Civilian Conservation Corps crews. In September 1936, J. C. Harrington became supervising archeologist of the project, and until World War II he continued the work as funds permitted. Except for the privately sponsored excavation of the Jamestown glasshouse site by Harrington in 1947, no extensive archeological work was thereafter undertaken until 1954, when John L. Cotter was appointed chief archeologist. Thorough exploration of Jamestown was his responsibility until 1956.[57]