XXX 
PHILOSOPHICAL SOCIETY OF WASHINGTON. 
1875. Thompson, Prof. A. H. (Almon Harris), 
Geological Survey. 1729 Twelfth street. 
1884. Thompson, Gilbert, 
Geological Survey. 1763 P street. 
1888. Tittmann, 0. H. (Otto Hilgard), 
Coast and Geodetic Survey. 1019 Twentieth street. 
1878. Todd, Prof. David P. (David Peck), 
Amherst College Observatory, Amherst, Massachusetts. 
1873. Toner, Dr. J. M. (Joseph Meredith), 
615 Louisiana avenue. 
1886. Trenholm, Wm. L. (William Lee), 
160 Broadway, New York, N. Y. 
1890. True, Dr. A. C. (Alfred Charles), 
Department of Agriculture. 1604 Seventeenth street. 
1882. True, Frederick W. (Frederick William), 
National Museum. 1101 14th street. 
1890. Turner, H. W. (Henry Ward), 
Geological Survey. 1808 H street. 
1882. Upton, Wm. W. (William Wirt), 
Atlantic Building, 930 F street. 1746 M street. 
1880. Upton, Prof. Winslow, 
Brown University, Providence, Rhode Island. 
1890. Van Hise, Prof. C. R. (Charles Richard), 
U. S. Geological Survey, Madison, Wisconsin. 
1883. Walcott, C. D. (Charles Doolittle), 
National Museum. 1746 Q street. 
1881. Waldo, Dr. Frank, 
95 Mercer street, Princeton, New Jersey. 
1872. Walker, Gen. F. A. (Francis Amasa), 
Massachusetts Institute of Technology, Boston, Mass. 
1876. Ward, Lester F. (Lester Frank), 
National Museum. 1464 Rhode Island avenue. 
1888. Warder, Prof. Robt. B. (Robert Bowne), 
Howard University. 
1889. Watkins, J. E. (John Elfreth), 
Smithsonian Institution. 1801 Thirteenth street. 
1882. Webster, Albert L. (Albert Lowry), 
107 Drexel Building, corner Wall and Broad sts., N. Y. 
