--On Pyrophyllite from Schuylkill Co., Penn. Read before Am. Phil. Soc'y, July 18, 1878. --Mineralogische Mittheilungen. 31 pp., 2 pl.--Zeit. für Krystallographie, 1885. --Jarosite from Utah. 1 p.--Am. Jour. Sci., Jan., 1890. --On Two Minerals from Delaware Co., Pa. 3 pp.--Proc. Acad. Sci. of Phila., 1889. --Contributions from the Laboratory of the University of Pennsylvania. =Gilbert, G. K.= --The Colorado Plateau Region considered as a Field for Geological Study. 27 pp.--Am. Jour. Sci., July and August, 1876. --The Strength of the Earth's Crust. 5 pp.--Bull. Geol. Soc. Am. Vol. I, 1889. --The History of the Niagara River. 24 pp., 8 pl.--Sixth An. Rept. of Com. of State Reservation at Niagara, 1889. --The Work of the International Congress of Geologists. 22 pp.--Am. Jour. Sci., Dec, 1887. --The Sufficiency of Terrestrial Rotation for the Deflection of Streams. 6 pp.--Nat. Acad. Sci., 1884. =Gordon, C. H.= --Observations on the Keokuk Species of Agaricocrinus. 7 pp., 1 pl.--Am. Geol., May, 1890. --On the Brecciated Character of the St. Louis Limestone. 9 pp., 2 pl.--Am. Nat., April, 1890. --Proceedings of the Iowa Academy of Sciences for 1887, 1889, 1889. 101 pp. --Quaternary Geology of Keokuk, Iowa, with Notes on the Underlying Rock Structure. 8 pp., 2 pl. =Grant, Uly. S.= --Notes on the Molluscan Fauna of Minnesota. 4 pp.--16th An. Rept. Geol. and Nat. Hist. Survey, Minn. (1887). --Account of a Deserted Gorge of the Mississippi near Minnehaha Falls. 6 pp., 1 pl. --Conchological Notes. 12 pp.--14th An. Rept. Geol. and Nat. Hist. Survey, Minn. --The Stratigraphical Position of the Ogishke Conglomerate of Northeastern Minnesota. 8 pp.--Am. Geol. Vol. X, July, 1892. --Report of Geological Observations made in Northeastern Minnesota during the Summer of 1888. 67 pp.--Geol. and Nat. Hist. Survey of Minn.; part IV. 17th An. Rept. =Hall, C. W.= --Notes on a Geological Excursion into Central Wisconsin. 18 pp., 1 pl. =Hallock, William.= --Chemical Action between Solids. 4 pp.--Am. Jour. Sci., May, 1889. --The Flow of Solids or the Behavior of Solids under High Pressure. 8 pp.--Bull. U. S. G. S., No. 55. --Ueber die Lichtgeschwindigkeit in verschiedenen Quartzflächen. 3 pp.--Annalen der Physik und Chemie, 1881. Bd. XII. --Preliminary Report of Observations at the Deep Well at Wheeling, W. Va.--Proc. A. A. A. S., 1891, vol. XL. =Harden, John Hy.=, M. E. --Rock Salt Deposit of Huron and Bruce Counties, Ontario, Canada. 6 pp.--Proc. Engineer's Club. Phila., Vol. I, No. 3. --The Construction of Maps in Relief. 23 pp., Ill., 1 pl.--Trans. Am. Inst. Min. Eng., 1887. =Harpe, Phil. de la.=