Dip, magnetic, daily variation in, _M. Kupffer_, xxv, 194. ----, ----, in different regions, _T. H. Perry_, xlvii, 84. ----, ----, at St. Petersburg, xxi, 382. ----, ----, in the U. States, xl, 380. ----, ----, ibid, _J. Locke_, xxxix, 319; xl, 149; xli, 15. ----, ----, ibid, _E. Loomis_, xxxiv, 290^f; xxxix, 41^f; xliii, 93. ----, ----, at Baltimore, _J. Locke_ and _Nicollet_, xlii, 238. ----, ----, at Baltimore and Philadelphia, _A. D. Bache_, xl, 375. ----, ----, at Nantucket, Mass., _W. Mitchell_, xlvi, 157. ----, ----, in Ohio and Michigan, _E. Loomis_, xxxviii, 397. Diplomatic cipher, new, iv, 377. Dipping compass, on the manipulations of, _J. Locke_, xlii, 235. ---- needle, theory of adjusting, _T. H. Perry_, xxxvii, 277. ---- ----, see _Magnetic Needle_. Dipyre, xlvii, 417. Disease among shell fish, _S. P. Hildreth_, xxxii, 97.^f Disinfection by means of alkaline chlorides, xiii, 169. ---- ---- of alcohol, xiii, 174. Disintegration of the dolomites of the Tyrol, _Daubeny_, xlii, 321. Dislocations, lines of, in Devonshire, _De la Beche_, xxxi, 354. ---- of strata in the U. States, _E. Hitchcock_, xli, 268. Diving bell, descents in, at Portsmouth, N. H., _T. Alden_, xxii, 325. ---- ----, heat during descent in, xxv, 196. Divining rod, iii, 102; xi, 201.^f Divisibility of a finite quantity of matter, on the infinite, _S. Clark_, ix, 356. ----, remarks on, x, 99. _Dix, D. L._, notice of the Aranea aculeata, Philæna antiqua, and some Papiliones, xix, 61.^f _Dixon's_ manufacture of lead pots, xxi, 196. _Döbereiner's_ researches respecting platina, xviii, 151. ----, on formic acid, xxviii, 126. ----, new compounds of platinum, xxviii, 130. _Dobson, P._, remarks on the origin of boulders, x, 217. ----, views on boulders, _Murchison's_ citation of, xliii, 200. Dog, tongueless, retaining the power of barking, xxxvi, 194. ---- sleds of the Northwest, xiii, 391.^f Dogs, anecdote of, xlvi, 243. Dolomisation, theory of von Buch, _Daubeny's_ objections to, xxxi, 372. ----, ---- ----, facts in Maine, not confirmatory of, _C. T. Jackson_, xxxvi, 147. Dolomite, analysis of, iv, 17. Dolomites of the Tyrol, disintegration of, _C. Daubeny_, xlii, 321. ----, in Africa, iv, 33. ----, in Connecticut, ii, 206; v, 36; viii, 255. ----, in Massachusetts, (fetid,) iii, 239; viii, 35. ----, in New York, iv, 17. Dominica, raised coral reef of, iv, 218. Donium, supposed new metal, _T. Richardson_, xxxi, 163. _Donovan, E._, notice of the works of, xxxvii, 163. _Doolittle, A._, the earliest American engraver, xxii, 183. _Doolittle, I._, on a new method of charring wood, xvii, 395.^f ----, on crank motion, xii, 367; xiv, 60.^f ----, gelatine from bones, i, 170. ----, description of a hydrostat, xiii, 64.^f ----, on the revolving steam engine of Morey, ii, 101.^f _Doornik, J. E._, observations on the use made of fossils in geological science, xv, 90. Dorudon, xlix, 216.