Appalachian chain, physical structure of, _H. D._ and _W. B. Rogers_, xliii, 177; xliv, 359. ---- ----, in Maryland, notices and geological sections, _W. E. A. Aikin_, xxvi, 219.^f Apparatus, chemical, for the combustion of metals in chlorine, _R. Hare_, xiv, 354.^f ----, ----, for procuring nitrogen, _R. Hare_, xiv, 356,^f xxviii, 263.^f ----, ----, for experimenting with carbonic acid gas, _R. Hare_, xiv, 358.^f ----, ----, substitute for Woulfe's bottles, _R. Hare_, i, 410^f; xiii, 1.^f ----, ----, for regulating the supply of gas by its absorption, _R. Hare_, xiii, 2.^f ----, ----, cold by the palm glass, _R. Hare_, xiii, 4.^f ----, ----, for showing the effect of a relaxation of pressure on capacity for heat, _R. Hare_, xiii, 5.^f ----, ----, for illustrating capacities for heat, _R. Hare_, xiii, 6.^f ---- for separating carbonic oxide from carbonic acid, _R. Hare_, xxiv, 252.^f ---- for producing ebullition by cold, _R. Hare_, xxxiii, 218.^f ---- for deflagrating carburets, phosphurets, &c., in vacuo, xl, 303.^f ---- for freezing water by means of sulphuric acid, _R. Hare_, xxvii, 132.^f ---- for obtaining specific gravity of gases, _R. Hare_, xvi, 293, 295.^f ---- for transferring or decanting liquids, _R. Hare_, xxvi, 358.^f ---- for the evolution of prussic acid, _R. Hare_, xxix, 244.^f ---- for evolving silicon from fluo-silicic acid, _R. Hare_, xxiv, 247.^f ---- for decomposition and recomposition of water, xxxviii, 336.^f ---- galvano-ignition, xxvi, 352^f; xxxii, 282. ---- for solidifying carbonic acid, _J. Johnston_, xxxviii, 297^f; xlii, 203. ---- for illustrating absorption of heat, _A. D. Bache_, xxviii, 320.^f ----, hydrogen gas, vii, 392. ---- ---- self-regulating reservoir, _R. Hare_, xi, 140.^f ---- for experiments on inflection and interference of light and caustics, _E. S. Snell_, xlix, 24,^f 26.^f ---- for illustrating waves, _E. S. Snell_, xlix, 20.^f ---- volumeter, _R. Hare_, xii, 36.^f ---- volumescope, _R. Hare_, xv, 275^f; xxviii, 264.^f ----, electrical, see _Electric_. ----, electro-magnetic, see _Electro-magnetic_. ----, eudiometric, see _Eudiometry_. Apprentices, manufactory of, iv, 379. Aqueducts, on the Roman, _M. Genieys_, xix, 389. Arabia, notice of a memoir on the province of Omán in, xxxii, 383. Arabic words in English, _J. W. Gibbs_, xxxiii, 324. Ararat, Mount, extinct volcano near, xxxvii, 349. Araucanian races, remarks on, _S. G. Morton_, xxxviii, 341.^f Arch, some properties of a rampant, _T. Gorton_, xxvii, 303.^f Arches, method of describing curves for, _J. Thomson_, xxiv, 73.^f ----, on tracing oval, _E. Miller_, xxii, 303.^f Archæologia Americana, iii, 357. Archimedes, on the spiral of, by _A. B. Quinby_, ix, 316.^f Archimedes, a fossil coral, _D. D. Owen_, xliii, 19.^f