---- _Same._ No. 788. Memoir of Heinrich Leberecht Fleischer. By A. Müller. From the Smithsonian Report for 1889. Washington, 1892. 21pp. ---- _Same._ No. 789. On aerial locomotion. By F. H. Wenham. From Smithsonian report for 1889. Washington, 1890. 21pp. ---- _Same._ No. 790. Photographs in the service of astronomy. By R. Radau. From the Smithsonian report for 1889. Washington, 1890. 22pp. ---- _Same._ No. 791. A memoir of Gustav Robert Kirchoff. By Robert von Helmholtz. From the Smithsonian report for 1889. Washington, 1890. 16pp. ---- _Same._ No. 792. The museums of the future. By G. Brown Goode. From the report of the Nat. Museum, 1888-'89. Washington, 1891. 21pp. ---- _Same._ No. 793. Te Pito te Henua, or Easter island. By W. J. Thomson. From the report of the Nat. Museum, 1888-'89. 108pp., 49 pls. ---- _Same._ No. 794. Aboriginal skin dressing. By O. T. Mason. From report of the Nat. Museum, 1888-'89. Washington, 1891. 39pp., 33 pls. ---- _Same._ No. 795. The puma or American lion. By F. W. True. From the report of the Nat. Museum, 1888-'89. Washington, 1891. 19pp., 1 pl. ---- _Same._ No. 796. Animals recently extinct or threatened with extermination, as represented in the collections of the U.S. Nat. Museum. By F. A. Lucas. From the report of the Nat. Museum, 1888-'89. Washington, 1891. 43pp., 11 pls. ---- _Same._ No. 797. The development of the American rail and track, as illustrated by the collection in the U.S. Nat. Museum. By J. E. Watkins. From report of the Nat. Museum, 1888-'89. Washington, 1891. 60pp. .25 ---- _Same._ No. 798. Explorations in Newfoundland and Labrador in 1887. By F. A. Lucas. From report of the National Museum, 1888-'89. Washington. 1891. 22pp., 1 pl. ---- _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. 4^o. 4pp., 23 col. pls. ---- _Same._ No. 801. Experiments in aerodynamics. By S. P. Langley. Washington, 1891. 4^o. 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