----, on the rocks of New York, xxxiii, 121. ----, naphtha in quartz crystals, i, 345. Deweylite from Middlefield, Mass., analysis of, _C. U. Shepard_, xviii, 81. ----, analysis of, _T. Thomson_, xxxi, 173. _De Witt, S._, mode of drawing ellipses, xxiv, 369.^f ----, a conical raingauge, xxii, 321.^f ----, obituary notice of, xxvii, 395. Diabetes, cause of, xlix, 202. Diabetic urine, to detect sugar in, xlix, 200. Diallage allied to Augite, xx, 168. ----, in Connecticut, vi, 227. Diamonds at Algiers, xxviii, 394. ----, pretended artificial, xvi, 394. ----, matrix of, _D. Brewster_, xxix, 366. ----, on the origin and the use of, xvii, 372. ----, remarkable, v, 175. ----, new structure in, _D. Brewster_, xxxiv, 37. ----, supposed locality in the United States, xxix, 394. ---- mines of Russia, xix, 199. Diamond Hill, N. Y., ii, 13. Diathermancy, _M. Melloni_, xxvii, 228; xl, 313. Dichroism of the palladio-chlorides of potassium and ammonium, xliv, 165. _Dickson, J._, geology and mineralogy of parts of N. and S. Carolina, iii, 1. Dicobune, xxxvii, 232. Dictionary of Anamitic and Latin, _Taberd_, xl, 43. ----, Morrison's Chinese, iii, 377. ---- of ancient and modern Greek, in course of publication, iii, 381. Didymium, a new metal, xliii, 404. ---- and cerium, method of separating the oxides of, xlvi, 206. Differential calculus, on the first principles of, _T. Strong_, xlv, 269. ----, equations of the second order, integration of, xlii, 273. Dikes, observed to have a crescent shape in Connecticut, _J. G. Percival_, xlvi, 205. ---- of trap, cause of crescent form, _H. D. Rogers_, xlv, 334. ---- ----, in the Connecticut valley, vi, 47, 56.^f ---- ----, of Maine, of four different ages, _C. T. Jackson_, xxxvi, 145. ---- ----, in Massachusetts, near Lowell, and at Nahant, &c., xxvii, 342. ---- ----, in Michigan, _D. Houghton_, xli, 184. ---- ----, in granite, New Hampshire, numerous, _O. P. Hubbard_, xxxiv, 105.^f ---- ----, or natural walls, of Rowan, N. C., xiv, 242. ---- ----, in Montgomery, Vt., xxii, 189. ---- ----, connection of, with the iron ores of Essex Co., N. Y., _E. Emmons_, xl, 81. ---- ----, effect on limestone, xxix, 351. ---- ----, action on mica slate, xxvii, 343. ---- of porphyry in Nova Scotia, xv, 203, 213. Dilatation of gases, _V. Regnault_, xliv, 63. Diluvial action, in Sullivan Co., N. Y., facts relating to, _W. A. Thompson_, xxiii, 243. ---- scratches, see _Scratches_. Dimorphism, viii, 378; xlvi, 370. Dinornis, notice of, _G. A. Mantell_, xlv, 184, 188. ----, ----, and on the Ornithichnites, _R. Owen_, xlv, 185; xlviii, 194. ----, bearing of, on the subject of fossil footprints, xlviii, 199. Dinotherium, _R. Harlan_, xli, 178. Diophantine problems, solutions of two, _T. Strong_, xxxi, 156. Dioptase, analysis of, Damour, xlvii, 216.