MARSHALL, R. B., U. S. Geological Survey, Berkeley, Cal. MASON, PROF. O. T., 1777 Massachusetts Avenue. MATTHEWS, DR. W., U. S. A., _a_, Fort Wingate, N. M. MELVILLE, ENG. IN CHIEF GEO. W., U. S. N., _a_, _l_, Navy Department. MENDENHALL, DR. T. C., Coast and Geodetic Survey. MENOCAL, CIV. ENG. A. G., U. S. N., _a_, 44 Wall Street, New York, N. Y. MERRIAM, DR. C. HART, _a_, Department of Agriculture. MERRILL, PROF. J. A., _c_, State Normal School, Warrensburg, Mo. MESTON, R. D., 1227 L Street. {xxviii} METZGER, F. P., Geological Survey. MILEY, A. E., Sixth Auditor's Office. MINDELEFF, MME. JULIE, 1401 Stoughton Street. MINDELEFF, VICTOR, Ohio National Bank Building. MITCHELL, PROF. HENRY, _a_, 18 Hawthorne Street, Roxbury, Mass. MOSMAN, A. T., _a_, Coast and Geodetic Survey. MUIR, PROF. JOHN, Martinez, Cal. MUIR, ENS. W. C. P., U. S. N., In care Hon. J. L. Beckham, Shelbyville, Ky. MUNROE, HERSEY, Geological Survey. MURLIN, A. E., Geological Survey. MURRAY, B. P., 10 Third Street NE. NELL, LOUIS, _a_, Geological Survey. NEWELL, F. H., Geological Survey. NILES, PROF. WM. H., Massachusetts Institute of Technology, Boston, Mass. NORDHOFF, CHARLES, _a_, Coronado, Cal. NORMAN-NERUDA, L., _c_, Devonshire Club, St. James Street, London, England. NORTHUP, C. G., U. S. Senate. NOYES, CROSBY S., 1101 Pennsylvania Avenue. OGDEN, HERBERT G., _a_, Coast and Geodetic Survey. O'HALLORAN, T. M., Hydrographic Office. O'HARE, DANIEL P., Geological Survey. OLDRINI, PROF. ALEXANDER, 1437 L Street. OLNEY, CHAS. F., 137 Jennings Avenue, Cleveland, O. OSBORN, LIEUT. A. P., U. S. N., _c_, Navy Pay Office, San Francisco, Cal. {xxix} OSBORNE, DR. GEO. L., _c_, State Normal School, Warrensburg, Mo. OTIS, HAMILTON, _c_, Massachusetts Institute of Technology, Boston, Mass. OTIS, WILLIAM H., U. S. Geological Survey, Berkeley, Cal. PALMER, T. S., Department of Agriculture. PARKER, E. W., Geological Survey. PARSONS, FRANCIS H., _a_, 210 First Street SE. PEALE, DR. A. C., _a_, Geological Survey. PEARY, CIV. ENG. R. E., U. S. N., Navy Department. PELLEW, HENRY E., 1637 Massachusetts Avenue. PENROSE, R. A. F., JR., 1331 Spruce Street, Philadelphia, Pa. PERKINS, E. T., JR., _a_, Geological Survey. PETERS, EUGENE, 458 Pennsylvania Avenue. PETERS, LIEUT. G. H., U. S. N., _a_, Navy Department. PETERS, WILLIAM J., _a_, Geological Survey. PETROFF, IVAN, _c_, 2148 Pennsylvania Avenue. PHILLIPS, ASA E., District Engineer Department. PHILLIPS, R. HENRY, Room 110, 1419 New York Avenue. PICKERING, PROF. EDWARD C., Harvard Observatory, Cambridge, Mass. PICKING, CAPT. HENRY F., U. S. N., Navy Department. PIERCE, JOSIAH, JR., 11 South Street, Baltimore, Md. POLLOK, ANTHONY, 620 F Street. *POND, EDWIN J., POWELL, MAJ. J. W., _a_, Geological Survey. POWELL, PROF. W. B., _a_, Franklin School. {xxx}