Pyrites, arsenical, in New Jersey, v, 244. ----, copper, see under _Copper_. ----, iron, origin of, in fossils, xxviii, 293. ----, ----, occurrence of, in fossiliferous rocks, xxxi, 74. ----, ----, investing quartz, vegetable stalks, &c., _L. Lyon_, xii, 162. ----, ----, in a peat field, _J. T. Plummer_, xliv, 312.^f ----, ----, specific gravity of, xix, 388. ----, ----, cause of decomposition of, xix, 387. ----, ----, of Rossie, complex crystal of, xlvi, 36.^f ----, ----, in Connecticut, i, 316; v, 44; vii, 56; x, 13; xxxiii, 160. ----, ----, in Georgia, xxiv, 9. ----, ----, in Kentucky, iii, 233. ----, ----, in Massachusetts, viii, 54; x, 13, 18; xxii, 51. ----, ----, in Missouri, iii, 67. ----, ----, in New Hampshire, xviii, 129, 131. ----, ----, in New Jersey, v, 28. ----, ----, in New York, v, 12; xix, 224; xxv, 350; xxviii, 172. ----, ----, in North and South Carolina, iii, 3; v, 262; xli, 183. ----, ----, in Ohio, xvi, 156, 157. ----, ----, in Pennsylvania, iv, 4; viii, 239; x, 222; xiv, 5, 6, 8, 13. ----, ----, in Vermont, i, 115; iii, 76, 326; vi, 245. Pyrochlore, analysis of, _F. Wöhler_, xviii, 392; xliii, 35. ---- of Chesterfield, Mass., _J. E. Teschemacher_, xlviii, 395. ----, identical with microlite, _J. E. Teschemacher_ and _A. A. Hayes_, xliii, 33. ---- and microlite, not identical, _C. U. Shepard_, xliii, 116; xlviii, 177. ----, analysis of, xlvi, 163. Pyro-citric acid, new, vii, 187. Pyro-gallic acid, _J. Pelouze_, xxviii, 126. Pyrogenic acid, new, xxxiv, 206. Pyroligneous acid, ii, 340; v, 188; ix, 201. ---- ----, purified by animal charcoal, xiii, 175. ---- ----, medical use of, ix, 201. Pyrometer, steam, _W. R. Johnson_, xxii, 96.^f Pyromorphite, or phosphate of lead, _C. Kersten_, xxii, 307. Pyrope at Brimfield, Mass., vi, 222. Pyrophorus, explosion of, x, 366. ----, new, from tartrate of lead, ix, 207. ----, remarks on, _Gay Lussac_, xvii, 176. ----, new, _R. Hare_, xix, 173. Pyrophyllite, xviii, 392. Pyrophysalite, ix, 21. Pyrotechny, history of, vii, 137. ----, _J. Cutbush_ on, ix, 173. Pyroxene, see _Augite_. Pyrrhite, xlvii, 340, 418. Q. Quackery, medical, iv, 390. Quadrant, _T. Godfrey_, the inventor of, xxxv, 389. Quadrupeds about Richmond, Indiana, xlvi, 244. ----, habits and anecdotes of, xlvi, 237, 243. ----, see farther under _Zoology_. Quantity of matter, effect of, on affinity, xvi, 234. Quarantine, high temperatures disinfecting and affording a substitute for, _W. Henry_, xxi, 392.