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284         THE MAGIC OF JEWELS AND CHAEMS
jasper in ancient times, and this stone was everywhere be­lieved to possess wonderful magic powers.
The jasper * as an emblem of strength and fortitude is noted by St. Jerome in his commentary on Isaiah (liv, 11, 12), where he writes that the bulwarks or walls of the Holy City were strengthened by jasper. These bulwarks served "to overthrow and refute every proud attack against the knowledge of God, and to subject falsehood to truth. Who­ever, therefore, is most convincing in debate and best forti­fied with texts of Holy Scripture is a bulwark of the Church."5 Jerome also alludes to the variety of jasper called grammatias, because of the peculiar markings, sug­gesting letters of the alphabet. This was believed to possess great talismanic virtue, especially in putting to flight phan­toms and apparitions, since the markings were thought to signify some potent spell, written on the stone by nature's hand. Of another kind of jasper, "white as snow or sea-foam,"6 and having reddish stains, we are told that it sym­bolizes the spiritual graces, which preserve those endowed with them from vain terrors ; and the learned Father quotes as descriptive of this stone the words of Solomon's Song (v, 10) : " My beloved is white and ruddy. ''7
Writing of the sapphire (lapis lazuli), one of the foun­dation stones of the Holy City, St. Jerome likens it to heaven and to the air above us, adding, somewhat fancifully, that we might apply to the sapphire the words of Socrates in the ' ' Clouds ' ' of Aristophanes : " I walk upon air and look down upon the Sun." Turning then to Holy Scripture, Jerome notes the well-known passage in Ezekiel (i, 26) where the
'Sometimes believed to be rock crystal.
'Sancti Eusebii Hieronymi " Opera Omnia," ed. Migne, vol. iv, Parisiis, 1865, col. 544.
* Δ stained or colored massive quartz.
'Sancii Eusebii Hieronymi " Opera Omnia," ed. Migne, vol. iv, Parisiis, 1865, col. 545.