Functions, relation of _Sturm's_, auxiliary to the roots of an algebraic equation, _Prof. Sylvester_, xlii, 163. Functional equation, solution of, _G. R. Perkins_, xlii, 69. Fungi, composition of, xlix, 393. Furnace for ventilating sewers, _R. Bulkley_, vii, 177. ----, hot blast, _T. Clark_, xxxi, 180. ----, ---- ----, saving by, xxviii, 71. ----, chimneys of, containing cadmia, xii, 168. ----, ----, containing titanium crystals, xii, 189. Furrows in rocks, see _Scratches_. Fur trade and fur-bearing animals, xxv, 311. Fusibility of mixture of carbonate of potash and carbonate of soda, xix, 379. Fusible metal, xxi, 371. Fusion of charcoal and anthracite, _B. Silliman_, v, 108, 361; vi, 341, 349, 378; viii, 147; x, 109, 119. ---- ----, _J. Griscom_, v, 364. ---- ----, _R. Hare_, viii, 288; x, 111, 118; xxxviii, 190. ---- ----, _L. Vanuxem_, viii, 292; x, 102. ---- by compound blowpipe, see _Blowpipe_. Fustic, yellow wood resembling, on the Red river, iii, 44. _Fyfe, A._, photographic processes, xxxvii, 175. G. Galactin, _T. Thomson_, xxxv, 303. _Gale, L. D._, apparatus for obtaining potassium, xxi, 60.^f ----, on the preparing and preservation of potassium, xix, 205.^f ----, on _T. D. Mitchell's_ mode of preparing carbonic oxide, xxvii, 129. Galena, crystallized by galvanism, _Becquerel_, xxviii, 291. ----, localities of, see _Lead ore_. _Galindo, J._, eruption of the volcano of Cosiguina, xxviii, 332. Galle's first comet, xxxviii, 378; xl, 207. ---- second, observations on, xl, 40; xl, 207. ---- three, notice of, xl, 207. Gallic acid, new process for obtaining, xvi, 395. ---- ----, new process for, _E. N. Kent_, xlvi, 78. ---- ----, _Döbereiner's_ method for, xxviii, 358. ---- ----, _Pelouze_, xxviii, 125.