Franconia iron works, viii, 180.
Franklin, B., original letters of, iv, 357; v, 157.
Franklinite, ii, 323; v, 41, (shot ore,) 242, 400.
Fraser, John, botanical labors of, A. Gray, xlii, 9.
Fresco painting, means of detaching, iv, 384.
Fredonia gas works, xvii, 398.
Freestone of Sugar Loaf mountain, Maryland, xxvii, 21.
Freezing mixture, Boutigny's, xxx, 168.
— —, xii, 195.
— point, influenced by pressure, L. C. Beck, xlv, 49.