_Bachman, J._, on the migration of the birds of North America, xxx, 81. _Bacon, Lord_, some notice of, _C. Fox_, xxxvi, 220. _Baddely, F. H._, on the red color of the flame from strontian, xviii, 261. ----, a new instrument for taking specific gravities, xviii, 263.^f ----, on the sulphate of strontian of Kingston, U. C., and on the geology of the vicinity, xviii, 104. ----, buoyancy of boulders at great depths, xxviii, 111. ----, gold in Lower Canada, xxviii, 112. ----, water limerock of Quebec, xxviii, 113. ----, cement of the Castle Rock, Quebec, xxviii, 367. _Baily's_ method of determining longitude, notice of, _E. Hitchcock_, ix, 107. _Bailey, J. W._, grasshoppers' legs, a substitute for frogs in galvanic experiments, xxxi, 292. ----, washing-bottles, forms of, xxxi, 292.^f ----, on the common blowpipe, xxxii, 319.^f ----, excursion to Mt. Katahdin, Me., xxxii, 20.^f ----, list of some plants in Maine, xxxii, 23. ----, new test for nitric acid, xxxii, 85.^f ----, locality of hyalite, xxxii, 87. ----, effect of a current of air on flame, xxxii, 88.^f ----, on the vascular system of ferns, xxxv, 113.^f ----, monstrous flower of Orchis spectabilis, xxxv, 117.^f ----, on yellow showers of pollen, xlii, 195.^f ----, on a curious fungus, Craterium pyriforme, xlii, 195. ----, on the crystals in the tissues of plants, xlv, 149; xlviii, 17.^f ----, fossil polythalamia from the upper Mississippi and Missouri, xli, 400.^f ----, ---- ----, in the U. States, xlviii, 340.^f ----, on fossil infusoria, in peat earth, West Point, N. Y., xxxv, 118.^f ----, infusoria of the family Bacillaria, xli, 284^f; xlii, 88^f; xliii, 321^f; localities, xliii, 328, 329.^f ----, ---- from Oregon, the Bermudas, Virginia and Maryland, with an extended catalogue, xlviii, 321.^f ----, ---- of New Haven harbor, xlviii, 337.^f ----, ---- of Charleston harbor, xlviii, 338.^f ----, ---- of N. Scotia, xlviii, 339. ----, ---- with bones of Mastodon, xlviii, 339. ----, ---- from Virginia, xlv, 313; xlvi, 137,^f 300; xlviii, 330. ----, ---- from Maryland, xlvi, 137^f; xlviii, 330. _Baird, W. M._ and _S. F._, list of birds found near Carlisle, Penn., xlvi, 261. ----, two new species of Tyrannula, xlvi, 273. _Baker, G._, vibrations of a mercurial pendulum, xlviii, 156. Baking, a machine for accelerating fermentation of flour, ix, 198. Balance, application of the principle of, to milking, churning, &c., _H. Strait_, xxvii, 92.^f Balance beam, Patten's, ix, 92.^f _Balande's_ collections of objects in natural history in Africa, iv, 373. _Baldwin, Wm._, two new species of Rottböllia, i, 355. _Ball, J._, remarks upon the geology and features of the country west of the Rocky Mountains, xxviii, 1. Ball's cave, Schoharie, notice of, xxvii, 368.