—, — — and silver, of Kewenaw Point, C. T. Jackson, xlix, 81.
—, Lake, height of, xlv, 16; xlvi, 259, 260.
Microlite, C. U. Shepard, xxvii, 361; xxxii, 338; xliii, 116; xlviii, 176.
—, identical with pyrochlore, J. E. Teschemacher and A. A. Hayes, xliii, 33.
—, reply to, ibid, by C. U. Shepard, xliii, 116; xlviii, 176.
—, analysis of, A. A. Hayes, xlvi, 158.
Micrometers, artificial spider's web for, xv, 183.
Microscope, on improvements in, E. Thomas, xix, 57.f
—, on the achromatic, E. Thomas, xx, 265.f
—, monochromatic lamp of D. Brewster for, vii, 363.