A CKNO WLED GMENTS. I OQ 



— A Mirror for Illuminating Opaque Objects for the Projecting Microscope. 

 2 pp. — Am. Phil. Soc'y, Feb. 20, 1S80. 



— The Progress of Chemical Theory; Its Helps and Hindrances. 37 pp. — 

 Journ. Franklin Instit., Apr., May and June, I$9I. 



— Mineral Formulce. 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 pi. — 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. Geo!., 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. 



— Archaean-Paleozoic Contact near Philadelphia, Penn. 6 pp., i pi. — Proc. 

 A. A. A. S., Vol. XXXIII, Sept., 1884. 



— Report of the Sub-Committee of the Berlin Congress of Geologists on the 

 Archaean. 80 pp. 



— Crystallization. II pp.. 111. — 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., i pi. 



— International Congress of Geologists, Reports of the Sub-Committee ap- 

 pointed 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. 1 1 pp., i pi. 



— " " 17 PP-, 2 pi. 



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 Geol- 

 ogical Society. Also Notes for a Comparison of the Volcanic Geology of Cen- 

 tral 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. Ill, 

 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 Ad- 

 dress Delivered at the 40th Anniversary Meeting of the Edinburgh Geological 

 Society, Nov. 6, 1873. 



