The principal contents of these letters were, however, incorporated with other matter into a more extensive article, which I contributed in 1819 to the Supplement of the Encyclopaedia Britannica. I had made drawings of the plates, which were engraved with great fidelity by Mr. Turrell, about a year before; and having been favoured by the proprietors with a few separate copies, I had sent them to some of my friends, in the summer of 1818, with a cover, on which was printed the title Hieroglyphical Vocabulary: these plates, however, were precisely the same that were afterwards contained in the fourth volume of the Supplement, as belonging to the article Egypt. The characters explained, with confidence, in this vocabulary, amounted to about 200; the number which had been immediately obtained from the pillar of Rosetta having been somewhat more than doubled by means of a careful examination of other monuments, on which the terms god, and king, and other epithets, already ascertained, were so applied as to furnish either certain or probable conclusions respecting the principal deities of the Egyptians, and respecting several of the latest and the most celebrated of their sovereigns. The higher numerals were readily obtained, by a comparison of some inscriptions, in which they stood combined with units and with tens. The hieratic manuscripts assisted also in this identification, by facilitating the determination of the hieroglyphic corresponding to a given enchorial character. The names of Phthah and of Apis were still left on the pillar: to these I was now enabled to add, with tolerable certainty, those of Ammon, or Jupiter, Phre, or the Sun, Rhea, or Urania, Ioh, or the Moon, Thoth, or Hermes, Osiris, Arueris, or Apollo, Isis, Nephthe, Buto, Horus, and Mneuis; besides a multitude of others, to whom I found it convenient to appropriate fictitious or temporary appellations, for the greater convenience of reference. Thus I have called Cerexochus, a figure whose real name was perhaps Amonrasonther, and my Hyperion and Platypterus are supposed by Mr. Champollion to belong to Horus and to Hercules. Of the kings, I have ascertained, as far as the testimony of the Greek and Latin historians and inscriptions would enable me, the names of Mesphres, Memnon, Sesostris, Nechao, Psammis, and Amasis; and having obtained the distinction of Ptolemy Soter from the pillar, I afterwards determined, by its assistance, the name of his queen Berenice. The termination indicating the female sex was another important result of this comparison of various monuments.