Xii CONTENTS. 



CHAP. Pa»e 



57. Five remedies derived from lime .. 375 



58. Maltha Jb. 



59. Gypsum .. •• 376 



60. Pavements. The Asarotos oecos ib. 



61. The first pavements in use at Rome .. .. .. .. 377 



62. Terrace-roof pavements . . . . . . . . . . . • ib, 



63. Grgecanic pavements .. .. .. .. .. .. 378 



64. At what period mosaic pavements were first invented. At 



what period arched roofs were first decorated with glass ., ib. 



65. The origin of glass .. .. .. 379 



66. The various kinds of glass, and the mode of making it . . 380 



67. Obsian glass and Obsian stone .. .. .. .. .. 381 



68. Marvellous facts connected with fire .. .. .. .. 383 



69. Three remedies derived from fire and from ashes . . . . ib. 



70. Prodigies connected with the hearth . . . . . . . . 384 



BOOK XXXVII. 



THE NATURAL HISTORY OF PRECIOUS STONES. 



1. The first use of precious stones .. .. .. .. .. 386 



2. The jewel of Polycrates .. .. .. .. .. .. ib. 



3. Thejewelof Pyrrhus 387 



4 Who were the most skilful lapidaries. The finest specimens 



of engraving on precious stones . . , . , . . . 389 



5. The first dactyliothecse at Rome .. .. .. .. 390 



6. Jewels displayed at Rome in the triumph of Pompeius Magnus ib. 



7. At what period murrhine vessels were first introduced at Rome. 



Instances of luxury in reference to them . . . . . . 392 



8. The nature of murrliine vessels .. .. ., .. .. 393 



9. The nature of crystal 394 



10. Luxury displayed in the use of crystal. Remedies derived from 



crystal 395 



11. Amber : the many falsehoods that have been told about it . . 397 



12. The several kinds of amber : the remedies derived from it . . 402 



13. Lyncurium : two asserted remedies .. .. .. .. 404 



14. The various precious stones, classified according to their prin- 



cipal colours . . . . . . . . . . , . . . 505 



1.5. Adanias : six varieties of it. Two remedies . . . . . . ib. 



16. Smaragdus 408 



17. Twelve varieties of the smaragdus .. .. .. .. 410 



18. Defects in the smaragdus .. .. .. .. .. 411 



19. The precious stone called tanos. Chalcosmaragdos .. .. 413 



20. Beryls: eight varieties of them. Defects in beryls .. .. 414 



21. Opals: seven varieties of them . . .. .. .. .. 415 



22. Defects in opals : the modes of testing them .. .. .. 416 



23. Sardonyx J the several varieties of it. Defects in the sardonyx 417 



I 



