----, Essex Co., and northern sources of the Hudson, remarks on, _W. C. Redfield_, xxxiii, 301^f; --settlement at MacIntyre and iron works, 303; Labradoritic rocks, 303; Lake Colden, 305; Avalanche lake, 307; Whiteface Mt., the notch, 308; barometrical observations, and heights above Lake Champlain and the ocean, 310, 311; mountain slides, 313; main source of the Hudson; fall of the Au Sable, 313; high peak of Essex, 314; boulders, 315; trap dike, 316; ascent of Mount MacIntyre, 317; elevation of the mountains, 319; head of the Hudson, 320^f; beds of iron, 323. ----, ----, _E. Emmons's_ Geological Report of, noticed, xxxvi, 26; --iron ore, dikes, ripple marks, 26; height of mountains, 27; variation of the needle, 28, 29. ----, ----, ibid, xl, 81; --iron ores, 81. ----, ----, height of mountains, _E. F. Johnson_, xxxvii, 84. ----, Kedidica Hook range, ii, 187. ----, Franklin Co., Duane, steel ore beds, xlvi, 26. ----, Fredonia gas, xvii, 398; xxxvi, 6. ----, Genesee Co., sulphuric acid spring, xxxvi, 10. ----, gypsum in, i, 243; iv, 36; v, 39, 40; xvi, 377; xxxvi, 38, 43. ----, Herkimer Co., calcareous tufa, with impressions of numerous plants, xxxvi, 11. ----, heights in, above the level of the sea, of points in the Palisade range, ii, 184. ----, heights in, above the level of the sea, of Lakes Erie, Ontario, Niagara, Rochester, &c., _C. Dewey_, xxxiii, 122. ----, ----, ---- ----, of Lake Colden, source of Hudson, Essex peak, Mount MacIntyre, Bald peak, Lake Champlain, &c. &c., _W. C. Redfield_, xxxiii, 320. ----, ----, ---- ----, of the country near Chatauque lake, Cayuga lake, Seneca lake, Niagara, Buffalo, Mohawk at Little Falls, Round top, Catskill Mountains, &c. &c., xlv, 16, 17. ----, ----, ---- ----, of Lake Champlain, Skeene's Mountain, Moriah, pass of Schroon Mountain, iron works at MacIntyre, Lake Henderson Outlet, &c. &c., _W. C. Redfield_, xxxiii, 311. ----, ----, ---- ----, of Essex peak, (Mount Marcy,) Mount MacIntyre, Mount Dix, Dial Mountain, _E. Emmons_, xxxvi, 28. ----, ----, ---- ----, of Lyon Mountain, Whiteface Mountain, Mount Marcy, xxxvii, 84. ----, Highlands, outline of the geology of, _A. Eaton_, v, 231. ----, ----, geology, mineralogy, scenery, &c., of, _J. Pierce_, v, 26; --minerals, 27; animals, 31; lakes and rivers, 32. ----, ----, geology and mineralogy of, _W. W. Mather_, xxi, 97. ----, hydraulic limestones in, xxxvi, 37, 44; xxxix, 96; xlvi, 29. ----, Hudson river, tertiary formations on the borders of, _J. Finch_, x, 227. ----, ---- ----, sources of, _W. C. Redfield_, xxxiii, 301.^f ----, Jefferson Co., mineralogy of a portion of, _J. B. Crawe_ and _A. Gray_, xxv, 346; Sackett's Harbor, and Watertown minerals, cave, Pillar point heavy spar, 346; Antwerp and Oxbow minerals, 347. ----, Long Island, peat near Newtown, xxxvi, 16.