The most famous conspiracy of silence in the history of antiquity is examined here by one of the three archaeologists entrusted by the Archaeological Society of Athens with the final excavations of the Sanctuary. He traces the history of the cult in the archaeological remains, from the first traces of habitation at the site in the Middle Bronze Age (around 1900 B.C.) to its final grandeur and decay in Imperial Roman times. A guided tour of the Museum at Eleusis, illustrated with photographs of objects in the Museum, as well as air views, plans, and detailed photographs of the ruins closely correlated with the text, takes into account the needs of the visitor at the site as well as the reader at home. Originally published in 1961. The Princeton Legacy Library uses the latest print-on-demand technology to again make available previously out-of-print books from the distinguished backlist of Princeton University Press. These editions preserve the original texts of these important books while presenting them in durable paperback and hardcover editions. The goal of the Princeton Legacy Library is to vastly increase access to the rich scholarly heritage found in the thousands of books published by Princeton University Press since its founding in 1905.