Fluorine in bones, notice of investigations regarding, xlvii, 419.

— —, J. L. Smith, xlvii, 131.

— —, source of, J. L. Smith, xlviii, 99.

— in recent bones, C. Daubeny, xlviii, 186.

Fluxions, a theory of, E. Wright, xiv, 330f; xv, 196; xvi, 53.f

—, solution of a problem in, T. Strong, xvi, 283; xvii, 69, 329; xviii, 67. (See [Forces, next page.])

Fluxional ratio, application of, E. Wright, xxiv, 298f; xxv, 93.f

Flying in the air, De Chabrier's views on, xix, 395.

Fogs, remarks on, W. C. Redfield, xxxiii, 54.

—, on the formation of, W. M. Carpenter, xliv, 40.