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OCULUS.
Oculus Mundi, 281.
Olivine, 140.
Omphax, 163.
Onyx-marble, 57, 254.
Onyx, distinguished from sardonyx,
257. -----German, 265.
Onyx vases, 262.
------whence exported, 264.
Opal, 271.
------mother of, 292.
Ophites, divining-ball, 280, 385, 396.
------marble, 281.
Ophthalmias, 274.
Orleans pastes, 357.
Ordeal by stones, 50.
Orites, 388.
Orloff diamond, 35.
Orpheus, 4 ; date of his Λιβικα, 397.
Ostracias, Marcasite, 276.
Ostrites, 384.
P.
Pseonites, 50. Psederos, gem, 61.
------opal, 272.
Palliotto
of S. Ambrogio, 409. Pan, gem, 92. Panama pearls, 233. Pattinson's
process, 70. Parthenon, donaria in, 406-7. Paste ruby, antique, 141.
Paste camei, 295, 351. Pastes, modern, 356.
------recipes for, 369.
Pearls, 227.
------Scotch, 231.
------largest known, 415.
Peregrina, la, 233. Peridot, 337.
------derived, 340.
Perozes,
pearl of, 231. Perperi, 115. Persine's gems, 197, 324. Persia, Shah of,
414. Persian treasures, 99. Petrus Arlensis, 274. Peruvian emerald,
313. Peruzzi, 29. Petitot,371. Phengites, 59. Philippus, 106.
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REPOUSSÉ.
Philip II.'s pearl, 233.
------diamond, 418.
Philoctetes,
healed, 384. Philostratus, 304, 370. " Pillow, the King's," 99.
Placidia's nuptial gift, 401. Plasma, 288. Plate, Roman, 80.
------rnediajval, 83.
------Gallic, 103.
Plato, adamas of, 20.
" Point," 28.
Polycrates, ring of, 309, 426.
Pompey's triumph, 232.
Poppœa's hair, 333.
Porcelain, 238.
------first known, 244.
------test of poison, 126.
Porphyry, 285.
Portland" Vase, 2G8.
Prasinus, 323.
Prehnite, 289.
Prometheus, chain of, 19.
Protoprodronius, 134.
Psellus, 7.
Ptolemies, cup of the, 262.
Pyrites, used for emery, 276, 307.
Pyrope garnet, 53.
------alloy, 116,214.
Pyrrhus, agate of, 416. Pythius, wealth of, 98.
Q.
Quartation, 114. Quicksilver, 71. Queen of Sheba's portrait, 353. Queen of Syra's necklace, 33(1.
E.
Rabanus Maurus, 10.
Ragiel. 11.
" Raja of Mattiin," 30.
Raspe's Catalogue, 428.
Receswinthus, crown of, 399.
Red jasper, 207.
Refining gold, 111.
" Regent," the, 36; history of, 418.
Rennes, patère de, 82.
" Repentance, Stone of," 338.
Repoussé work, 78.
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