Photography, lamp black in, 401. " pigments generally in, 401. Pickle Green, 276. Picric acid, 162. Picture galleries, 363-365. Pictures and pigments, 292. Pigment and colour, 31. Pigments, action of fire and time on 31. " adulteration of, 70. " apt to vary, 126, 181. " beauty in, 46. " blending of, 37. " common, 359. " compound, 36. " drying of, 50. " fineness of texture in, 50. " grinding of, 37. " individual beauty of, 58. " innoxious, 53. " on the Durability and Fugacity of, 31. " on the General Qualities of, 46. " opacity and transparency of, 48. " past and present, 293. " rays from, 384. " truth of hue in, 47. " vehicles with, 48-53. " working well, 49. Pink, Brown, 313. " Dutch, 100. " English, 100. " Italian, 100. " Madder, 144. " Rose, 173. " Saucers, 174. Pitch, Jew's, 337. " Mineral, 337. Pittacal, 234. Platinum Blue, 233. " Yellow, 121. Playfair, Dr. Lyon, 355. Pliny, 7, 153, 198, 218, 295, 338. Plumbago, 393. Polygnotus, 9. Pompeii, 105, 229. Porcelain, blue for, 235. " green for, 267. Poussin, 11, 316. Powder Blue, 196. Power of pigments, individual, 59. Powers of colours, 82. Practice of Sir J. Reynolds, 37. Precipitate, Red, 173. Prevention and cure, 412. Price, Dr. D. S., 69. Primary colours, 28. Principles of practice, 35. Process, Autotype, 401. Protoxide, pigments in the state of, 37. Proust, M., 396. Prout, Samuel, 346. Prout's Brown, Liquid, 345. Prussian Black, 404, 408. " Copper, 408. Prussian Blue, 203. " adulteration of, 203. " character of, 237, 278, 301. " Cobalt, 227. " manufacture of, 203. " Native, 207, 226. " want of a permanent, 189. " with alkalies, 206. Prussian Brown, 348. " " French, 255. " Greens, 281, 282. " Red, 149. Prussiate of Copper, 323. " Iron, 203. Pure Scarlet, 150. " Ultramarine, 216. Purple, 28. " as a colour, 295. " as a pigment, 297. " Black, 369, 408. " Brown, 359. " contrast of, 294, 297. " Lake, 137. " on the Secondary, 294. PURPLE PIGMENTS:-- Archil Purple, 303. Bismuth Purple, 304. Burnt Carmine, 298. Burnt Lake, 298. Burnt Madder, 305. Cassius's Purple Precipitate, 306. Cobalt Purples, 305. Field's Purple, 301. Gold Purple, 306. Indian Purple, 298. Mars Violet, 290. Mauve, 163. Mineral Purple, 290. Mixed Purple, 290. Prussian Purple, 307. Purple Madder, 301. Purple Ochre, 290. Purple of Cassius, 306. Purple Rubiate, 301. Sandal Wood Purple, 307. Solid French Purple, 304. Tin Violet, 308. Violet Carmine, 302. Violet de Mars, 290. Purple, pure, 300. " Tyrian, 295, 296. Purpurates, 170. Purree, 98. Q. Qualities of Pigments, on the General, 46.