—— Same. No. 799. Preliminary handbook of the department of geology of the U.S. Nat. Museum. By G. P. Merrill. From the report of the Nat. Museum, 1888-'89. Washington, 1891. 52pp. .15
—— Same. No. 800. Plates prepared between the years 1849 and 1859 to accompany a report on the forest trees of North America. By Asa Gray. Washington, 1891. 4o. 4pp., 23 col. pls.
—— Same. No. 801. Experiments in aerodynamics. By S. P. Langley. Washington, 1891. 4o. iii, 1-115pp., 10 pls.1.00
—— Same. No. 802. Proceedings of the Regents and report of the Executive committee for 1889-'90, etc. From Smithsonian report 1890. Washington, 1891. 35pp..10
—— Same. No. 803. The squaring of the circle. By Herman Schubert. From the Smithsonian report for 1890. Washington, 1891. 26pp.
—— Same. No. 804. The progress of astronomy for 1889-1890. By William C. Winlock. From the Smithsonian report for 1890. Washington, 1891. 64pp..20
—— Same. No. 805. Mathematical theories of the earth. By Robert Simpson Woodward. From the Smithsonian report for 1890. Washington, 1891. 20pp..10
—— Same. No. 806. On the physical structure of the earth. By Henry Hennessy. From the Smithsonian report for 1890. Washington, 1891. 21pp..10
—— Same. No. 807. Glacial geology. By James Geikie, F.R.S. From the Smithsonian report for 1890. Washington, 1891. 10pp. .05
—— Same. No. 808. The history of the Niagara river. By G. K. Gilbert. From the Smithsonian report for 1890. Washington, 1891. 29pp..10