The original names seem to have been introduced by the Romans during the later period of the republic. That the idea is derived from Egypt is shown by a passage in Dion Cassius [l. XLIII., c. 26; compare E. Roth, "Geschichte userer abendländischer Philosophie," I., pag. 211]. The question when and how they were introduced by our forefathers will perhaps remain forever a matter only of conjecture. It has caused astonishment that the order in which the days were named after the planets, though the same with all nations, is not the order in which they were supposed to be placed in the universe (Saturn, Jupiter, Mars, the Sun, Venus, Mercury and the Moon). This riddle is solved by the passage in Dion Cassius referred to, in a manner such that the astrological origin of this nomenclature must be undoubted. He relates, namely, that the Egyptians devoted every one of the twenty-four hours to a certain planet. The first hour of the first week-day (Saturday) was given to the uppermost planet, Saturn, the second to Jupiter, the third to Mars and so on, according to the order of the planets. The 24th hour of Saturday consequently fell also to Mars, and the first hour of the succeeding day to the Sun, by which that day was therefore named Sunday. The 24th hour of Sunday falls according to the same calculation to Mercury, and the first hour of Monday to the Moon; and so on. The astrological distribution of the hours between the planets according to their successive order in the heavens thus explains the apparent disorder which occurs in the week. In the magical works by Cornelius Agrippa, Peter de Albano and others, of which the author has availed himself, tables concerning the distribution of the hours are found. These writers have collected from all quarters, and not least from Ptolemy and the Alexandrians, materials for their magical apparatus. [35] The prescriptions for these perfumes are found in Cornelius Agrippa's "Occulta Philosophia," l. I., c. 44. [36] They are found in Agrippa's "Occulta Philosophia," l. III. cc. 25, 26, 27, 28.