Acknowledgments Rob Hunter is thanked for providing the opportunity to present this review article in Ceramics in America. It is largely based on earlier work that was supported by Natural Sciences and Engineering Research Council, and Social Sciences and Humanities Research Council of Canada operating grants to the author. Thanks are also extended to the many museum curators and ceramics enthusiasts who generously made available sherds for chemical analysis, and to Rod Jellicoe for making available photographs of the porcelain objects. .1. J. Victor Owen, “Provenience of Eighteenth-Century British Porcelain Sherds from Sites 3B and 4E, Fortress of Louisbourg, Nova Scotia: Constraints from Mineralogy, Bulk Paste and Glaze Compositions,” Historical Archaeology 35, no. 2 (2001): 108–21. 2. F. Hamer, and J. Hamer, The Potter’s Dictionary of Materials and Methods, 4th ed. (London: A & C Black, 1997). 3. Harry Frost, personal communication, 1998. 4. J. Victor Owen, “Compositional and Mineralogical Distinctions Between Bonnin and Morris (Philadelphia, 1770–1772) Phosphatic Porcelain and Its Contemporary British Counterparts,” Geoarchaeology (in press). 5. J. Victor Owen, and T. E. Day, “Assessing and Correcting the Effects of the Chemical Weathering of Potsherds: A Case Study Using Soft-Paste Porcelain Wasters from the Longton Hall (Staffordshire) Factory Site,” Geoarchaeology 13 (1998): 265–86. 6. J. Victor Owen, B. Adams, and R. Stephenson, “Nicholas Crisp’s ‘porcellien’: A Petrological Comparison of Sherds from the Vauxhall (London; c. 1751–1764) and Indeo Pottery (Bovey Tracey, Devonshire; c. 1767–1774) Factory Sites,” Geoarchaeology 15 (2000): 43–78. Owen, “Provenience of Eighteenth-Century British Porcelain Sherds from Sites 3B and 4E, Fortress of Louisbourg, Nova Scotia.” 7. M. Bimson, “The Composition of Vauxhall Porcelain,” Transactions of the English Ceramic Circle 13, no. 3 (1989): 226–27. Owen, Adams, and Stephenson, “Nicholas Crisp’s ‘porcellien’: A Petrological Comparison of Sherds.” 8. J.Victor Owen, “Geochemistry of Phosphatic- and Silicious/Aluminous-Porcelain Sherds from the Coalport Factory Site,” in D. Barker and W. Horton, Post-Medieval Archeology 33 (1999): 3–93, appendix, 82–87. 9. H. Eccles, and B. Rackham, Analysed Specimens of English Porcelain (London: Victoria and Albert Museum, 1922). 10. I. Freestone, “A Technical Study of Limehouse Ware” in D. Drakard, ed., Limehouse Ware Revealed (Beckenham, Kent: English Ceramic Circle, 1993), pp. 68–77. J. Victor Owen, “A Preliminary Assessment of the Geochemistry of Porcelain Sherds from the Limehouse Factory Site, London” in K. Tyler, and R. Stephenson, The Limehouse Porcelain Manufactory, MoLAS Monograph 6 (2000), pp. 61–63. 11. J.Victor Owen and P. Williams, “Compositional Constraints on the Provenance of a True-Porcelain Chocolate Mug from the Rockingham Inn (c. 1796–1833) Site, Bedford, Nova Scotia,” Canadian Journal of Archaeology 23 (1999): 51–62. 12. J.Victor Owen and J. Sandon, “Petrological Characteristics of Gilbody, Pennington, and Christian/Pennington (18th-century Liverpool) Porcelains and Their Distinction from Some Contemporary Phosphatic and Magnesian/Plombian British Wares,” Journal of Archaeological Science 25 (1998): 1131–47. 13. R. Philpotts and N. Wilson, “Application of Petrofabric and Phase Equilibria Analysis to the Study of a Potsherd,” Journal of Archeological Science 21 (1994): 607–18. 14. O. P. Gosselain, “BonWre of the Enquiries. Pottery Firing Temperatures in Archaeology: What For?” Journal of Archeological Science 19 (1992): 243–59. 15. J.Victor Owen and M. L. Morrison, “Sagged Nantgarw Porcelain (1813–1820): Casualty of OverWring or a Fertile Paste?” Geoarchaeology 14 (1999): 313–32. 16. Ibid. 17. George Savage, 18th-Century English Porcelain (London: Spring Books, 1964), pp. 56–62. 18. See Owen and Morrison, “Sagged Nantgarw Porcelain (1813–1820).” 19. J.Victor Owen and R. Barkla, “Compositional Characteristics of 18th-Century Derby Porcelains: Recipe Changes, Phase Transformations and Melt Fertility,” Journal of Archaeological Science 24 (1997): 127–40. 20. J.Victor Owen and T. E. Day, “Assessing and Correcting the Effects of the Chemical Weathering of Potsherds: A Case Study Using Soft-paste Porcelain Wasters from the Longton Hall (Staffordshire) Factory Site,” Geoarchaeology 13 (1998): 265–86. 21. Owen and Morrison, “Sagged Nantgraw Porcelain (1813–1820).” 22. J.Victor Owen, J. O. Wilstead, R. Williams, and T. E. Day, “A Tale of Two Cities: Compositional Characteristics of Some Nantgarw and Swansea Porcelains and Their Implications for Kiln Wastage,” Journal of Archeological Science 25 (1998): 359–75. 23. J.Victor Owen, “On the Earliest Products (c. 1751–52) of the Worcester Porcelain Manufactory: Evidence from Sherds from the Warmstry House Site, England,” Historical Archaeology 32 (1998): 60–72. 24. J.Victor Owen, “Compositional and Mineralogical Distinctions between Bonnin and Morris (Philadelphia, 1770–1772) Phosphatic Porcelain.” 25. Owen, “Provenience of Eighteenth-Century British Porcelain Sherds from Sites 3B and 4E, Fortress of Louisbourg, Nova Scotia.”