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ACKNOWLEDGMENTS.
109
    • A Mirror for Illuminating Opaque Objects for the Projecting Microscope.2 pp.—Am. Phil. Soc'y, Feb. 20, 1880.
    • The Progress of Chemical Theory; Its Helps and Hindrances.37 pp.—Journ. Franklin Instit., Apr., May and June, 1891.
    • Mineral Formulæ.6 pp.—Proc. Acad. Nat. Sci., Phila., July 7, 1874.
    • Notes from the Literature on the Geology of Egypt, and Examination of the Syenitic Granite of the Obelisk which Lieut. Comd'r Gorringe, U. S. N., brought to New York.27 pp., 4 pl.—Trans. Am. Inst. Mining Engin., 1883.
    • Report of Committee on the International Congress of Geologists.3 pp.—Proc. A. A. A. S., Vol. XXXIX, 1890.
    • On Certain Trap Rocks from Brazil.3 pp.—Proc. Acad. Sci., Phila., 1876.
    • An Unjust Attack.8 pp.—Am. Geol., Jan., 1889.
    • The Philadelphia Meeting of the International Congress of Geologists.10 pp., Am. Geol., June, 1890.
    • Report of the Berlin International Geological Congress.13 pp.—Am. Jour. Sci., XXX, December, 1885.
    • Mesozoic Sandstone of the Atlantic Slope.9 pp.—Am. Nat., May, 1879.
    • Archæan-Paleozoic Contact near Philadelphia, Penn.6 pp., 1 pl.—Proc. A. A. A. S., Vol. XXXIII, Sept., 1884.
    • Report of the Sub-Committee of the Berlin Congress of Geologists on the Archæan.80 pp.
    • Crystallization.11 pp., Ill.—Journal Franklin Inst., Aug., 1885.
    • Origin of the Lower Silurian Limonites of York and Adams Counties,6 pp.—Am. Phil. Soc'y, March 19, 1875.
    • The Northern Serpentine Belt in Chester County, Pa.8 pp.—Trans. Am. Inst. Min. Engin., 1883.
    • The Persistence of Plant and Animal Life under Changing Conditions of Environment.13 pp.,—Am. Nat., June, 1890.
    • International Congress of Geologists, 1886.109 pp., 1 pl.
    • International Congress of Geologists, Reports of the Sub-Committee appointed by the American Committee.239 pp., 1888.
    • Other Short Articles.
  • Frisbie, Dr. J. F.
    • Glacial Moraines.16 pp.
    • Mountain Building and Mountain Sculpture.13 pp.
    • The Franconia Flume, the Causes that led to its Formation.8 pp.
    • Planet Building.11 pp., 1 pl.
    • Planet" Building."17 pp., 2 pl.
  • Geikie, Sir Archibald, LL.D., D.Sc., F.R.S.E., P.G.S.
    • Address to the Geological Section of the British Association.23 pp.
    • Address by Sir Archibald Geikie, President of British Association for the Advancement of Science.1892.24 pp.
    • Progress of the Geological Survey in Scotland.10 pp.—Proc. Royal Soc'y, Edinburgh, Vol. II, Session 1864-5.
    • On the Tertiary Volcanic Rocks of the British Islands.4 pp.—Proc. Royal Soc'y, Edinburgh, 1866-67.
    • The History of Volcanic Action during the Tertiary Period in the British Islands (Abstract).5 pp.—Proc. Royal Soc'y, Edin., 1888.
    • Address delivered at the 36th Anniversary Meeting of the Edinburgh Geological Society.Also Notes for a Comparison of the Volcanic Geology of Central Scotland with that of Auvergne and the Eifel.16 pp.—Trans. of the Edinburgh Geological Society, 1869-70, Vol. II, Part I.
    • On Modern Denudation.38 pp.—Trans. Geol. Soc'y of Glasgow, Vol. III, P. 153.
    • On Denudation now in Progress.6 pp.—Geol. Mag., Vol. I, No. 6, June, 1868.
    • Earth Sculpture and the Huttonian School of Geology.The Inaugural Address Delivered at the 40th Anniversary Meeting of the Edinburgh Geological Society. Nov. 6, 1873.