The earliest and most helpful of all the discoveries was that of the famous Rosetta Stone, found by a French artillery officer in 1799, while Napoleon's soldiers were excavating preparatory to erecting fortifications at Fort St. Julien. The deciphering of its trilingual inscriptions was the greatest literary feat of modern times, in which Dr. Thomas Young and J. F. Champollion share almost equal honours. Jean Francois Champollion (1790-1832) is perhaps the most famous of the early students of Egyptian hieroglyphs. After writing his "_De l'ecriture hieratique des anciens egyptiens_" at Paris, he produced in 1824 in two volumes, his "_Precis du systeme hieroglyphique des anciens egyptiens,_" on which his fame largely depends, as he was the first to furnish any practical system of deciphering the symbolic writing, which was to disclose to the waiting world Egyptian history, literature, and civilisation. Champollion wrote many other works relating to Egypt, and may truly be considered the pioneer of modern Egyptology. While much of his work has been superseded by more recent investigations, he was so imbued with the scientific spirit that he was enabled securely to lay the foundation of all the work which followed. [Illustration: 321.jpg THE GREAT HALL OF ABYDOS] The distinguished French savant, Augustus Mariette, (1821-1881) began his remarkable excavations in Egypt in the year 1850. The series of discoveries inaugurated by him lasted until the year 1880. Mariette made an ever-memorable discovery when he unearthed the famous Serapeum which had once been the burial-place of the sacred bulls of Memphis, which the geographer Strabo records had been covered over by the drifting sands of the desert even in the days of Augustus. [Illustration: 322.jpg PROPYLON AT DENDERAH]