_Daggett, H._, on the cutting of steel by soft iron, vi, 336. Daguerrotype process, _Daguerre's_, xxxvii, 374; xxxviii, 97. ---- ----, improvement in, _F. A. P. Barnard_, xli, 352. ---- ---- and its applications, _W. H. Goode_, xl, 137. ---- experiment by galvanic light, _B. Silliman, Jr._ and _W. H. Goode_, xliii, 185. ---- pictures, mode of fixing, engraving, and printing from, _Dr. Berres_, xxxix, 385. ----, see farther under _Photography_. Dahlias, notes concerning, xxiv, 208. Daltonism, remarks on, _Prof. Wartmann_, xlii, 162. _Dalyell, J. G._, on the propagation of Scottish Zoophytes, xxviii, 77. Dams, vibrating, account of, _E. Loomis_, xlv, 363.^f ----, time of vibration calculated from the dimensions of, xlv, 373. Damascus cutlery, v, 182. _Dana, J. D._, description of the Argulus Catostomi, xxxi, 297.^f ----, ---- of the Caligus Americanus, xxxiv, 225.^f ----, ---- of two species of Hydrachna, xxx, 354.^f ----, metamorphosis of Anatifæ, and their relation to Crustacea, xlv, 335. ----, classification of minerals, xlvi, 374. ----, drawing of figures of crystals, xxxiii, 30.^f ----, crystallographic symbols, xxviii, 250. ----, on the formation of twin crystals, xxx, 275.^f ----, crystallization of the so-called Edwardsite, (monazite,) xxxiii, 202.^f ----, crystals of quartz, magnetic iron, apatite, and calc spar, distorted, xlvi, 365.^f ----, ---- pyrites, Rossie, xlvi, 36.^f ----, ---- datholite, xlvi, 380.^f ----, ---- zircon, tesselated, xlvi, 36.^f ----, eremite identical with monazite, xlv, 402.^f ----, Torrelite identical with Columbite, xxxii, 149.^f ----, measurement of Lederite, showing its identity with sphene, xlviii, 180. ----, minerals in crystallized limestones, produced by heat acting on constituents and impurities of non-crystallized limestones, xlvii, 135. ----, origin of the constituent and adventitious minerals of trap rocks, xlix, 49. ----, ---- of boracic acid in native borates, xlix, 61. ----, ---- of mountains, xlv, 128. ----, ---- of serpentine, xlv, 120. ----, ---- of zeolites, xlv, 116. ----, observations on pseudomorphism, xlviii, 81, 397. ----, on the analogies between modern igneous rocks, and the so-called primary formations, xlv, 104. ----, schistose structure due to state of crystallization of constituents, xlv, 105. ----, temperature limiting the distribution of corals, xlv, 130, 310. ----, areas of subsidence in the Pacific, indicated by the distribution of coral islands, xlv, 131^f, 310. ----, notice of Vesuvius, in 1834, xxvii, 281. ----, withdrawal of a charge against _J. P. Couthouy_, xlvii, 122. ----, reply to _Mr. Couthouy_, xlvi, 129. ----, System of Mineralogy by, reviewed, xlvi, 362.^f