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Figure 49  Mug fragments, William Rogers, Yorktown, Virginia, 1720–1745. Salt-glazed stoneware. H. (right) 2 1/2". (Courtesy, National Park Service, Colonial National Historical Park, Yorktown Collection.) COLO Y 10,896, COLO Y 10,942. The function of the holes in these mugs has never been satisfactorily explained, but one suggestion is that they served as trial pieces which could have been extracted from the kiln during firing to check on the quality of glazing.