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TABLE OF < Platine. Platinum. Its pro perties. 567. — how rendered mal leable, 574. a. n. method of Mr. A- achard, 576. b. 11. Its fpecific gravities, 571. b. n. Plumbago, its properties, 451. a. Plumbago of iron, 453. c. n. Plumbum, 644. a. Plumbum ujlum, 645. b. n. PocketLaboratory(TheDry) 9 2 9‘ b - 977' — (The Humid), 988. b. (The Lamp Furnace), 991. r. Polarity of attra&ion, 429. e. 11. Poles (falfe) of ele&ricity, 155. b. n. Pompbohx, 790- b. 11. Ponderous earth, 84. 940. b. n. . ipar, 85. c. n. . aerated, 87. a. —— drulen, 89. b. vit'iolata, 382. a. Ponderous earth (its proper ties), 94O. b. n. Pont-marle, 54. b. Porcelain earth, 103. b.— 232. b. Porjidt, 879. a. Pori, 77. a. Porphyry, (calcareous) 83. a. Porphyry, 879. a. porphyrttes, 879. a. Portland-ftone, 78. a. Potters lead-ore, 499. b. CONTENTS. 1033 Potter’s ore, 661. c. n. Potzevera, 106. a. Prafe, 144. c . n. Precious ftones falfely called Oriental or occidental, 125, c. n. Precious ftones (obfervations On), 161. a. Precious ftones analyzed, i6i. b. n. Prince’s metal, 708. b. Probatory liquor of orpi- ment, 822. c. n. Prulian blue, native, 733. a. Pleudo-agate, 159. r. 11. Pfeudo-galena, 778. b. n.—~ Pfeudopalm, 177. /;. Pudding-ftone, 82. b. Pnlvis py'ophorus, 397. b. Pumiceftone (pumex), 917. c, Purbeck ftone, 78. a. Putty, 643. c. n. Puzzo.'ana, 72. b, Pyritaceous lime-ftone, 83. a. Pyrit.s fubflavus, 497. b, rubtfcens, 498. a. Pyritical gold-ore, 499. c . Pyrometer of Wedgwood, 228. a. n. Pyromacbus, 189. a. Pyropborus,'X , i^,b.—397. c. n. Qz Quartz, 165. a. rock cryftal, 168. b. and 172- a. heterogeneous, 171. a. ——— its feven fpecies, 174. b. n. obfervations, 172. b. P p p Quartz,