---- of Heulandite, of Paterson and Bound Brook, N. J., _L. C. Beck_, xliv, 59.^f ---- of Humboldtilite, xi, 251.^f ---- of idocrase, from Amherst, N. H., xlvi, 381.^f ---- of iodic acid, xx, 185. ---- of iodine, xvii, 168; xviii, 84.^f ---- of iron, magnetic, distorted, _J. D. Dana_, xlvi, 365.^f ---- of Lederite, _C. U. Shepard_, xxxix, 357.^f ---- ----, _J. D. Dana_, xlvi, 36^f; xlviii, 180. ---- of ferro-silicate of manganese, from Rhode Island, _C. U. Shepard_, xvii, 142.^f ---- of microlite, _C. U. Shepard_, xxvii, 361. ---- of pyrites, Rossie, _J. D. Dana_, xlvi, 36.^f ---- of quartz, bent, xlvi, 366.^f ---- ----, soft, from Carara, Italy, v, 394. ---- ----, distorted, xlvi, 365.^f ---- ----, containing globules of water, from Elba, iv, 27. ---- ----, ibid, in U. States, ii, 14; ix, 246. ---- ----, containing naphtha, _C. Dewey_, i, 345. ---- of serpentine, of Warwick, N. Y., ix, 242. ---- of Sillimanite, xlvi, 382.^f ---- of snow, ii, 337^f; iii, 367.^f ---- of staurotide, macle, _C. T. Jackson_, xlvi, 368.^f ---- of topaz, distribution of coloring matter in, and optical properties of, vii, 364. ---- of zircon, tesselated, _J. D. Dana_, xlvi, 36.^f Crystalline forms, two, presented by the same substance, viii, 378; xlvi, 370. ----, substances from the juice of plants, xi, 391. Crystallization, tendency to, in matter, xix, 381. ----, on the influence of air on, _M. Graham_, xvii, 373. ---- effected by the action of weak electric forces, _M. Becquerel_, xvii, 383; xxviii, 291. ---- ---- ibid, _G. Bird_, xxxiii, 267. ---- ---- ----, _A. Crosse_, xxxv, 125.^f ----, an instance of instantaneous, _J. Green_, iii, 93. ---- of snow, _J. Green_, ii, 337.^f ----, curved, of gypsum, Mammoth Cave, Ky., _J. Locke_, xlii, 206.^f ---- the cause of the schistose structure and cleavage of some rocks, _J. D. Dana_, xlv, 105. ---- of carbonate of potash, viii, 181. ---- of the carburets, _S. Brown_, xxxviii, 118. ---- of oil of sassafras, remarkable, _A. A. Hayes_, xx, 128. ---- of water, light from, xxvi, 178. Cuba, coal mines in, _J. H. Blake_, xlii, 388. ----, fossils of, supposed to be oolitic, _J. Lea_, xl, 41. ----, meteorological observations in, _J. H. Blake_, xlii, 292. Culmites, vii, 180. Cummingtonite, named and described, _C. Dewey_, viii, 59. ----, locality in Massachusetts, viii, 233; ix, 43, 54. _Cunningham, R._, obituary notice of, xxxii, 215. Cupellation, new method of, _W. W. Mather_, xxxv, 321. ----, a mode of, _G. Engelmann_, xlii, 394.