VI CONTRIBUTORS TO THE TWELFTH VOLUME CHABLES L. HOGEBOOM, M. D. NITEIO ACID. NITROGEN. NUTRITION. OXYGEN. OZONE. Prof. T. STEKRY HUNT, LL. D., Mass. Inst. of Technology, Boston. MOUNTAIN. ROSSITEE JOHNSON. NIGHTINGALE, FLORENCE, OATES, TITUS, ODD FELLOWS, OLIPHANT, CAROLINA, ORVIETO, and other articles in biography and geography. Prof. 0. A. JOY, Ph. D., Columbia College, New York. NAPHTHA, NAPHTHALINE, NICKEL, OXALIC ACID, and other chemical articles. Prof. S. KNEELAND, M. D., Mass. Inst. of Technology, Boston. MYLODON, NAUTILUS, OCTOPUS, ORNITHOLOGY, OWL, Ox, OYSTER, and other articles in zoology. Prof. JAMES LAW, Cornell University, Ithaca, MURRAIN. Rev. SAMUEL LOOKWOOD, Ph. D., Freehold, N. J. NEWCOMB, SIMON. Prof. THOMAS R. LOUNSBURY, Yale College. NELSON, HORATIO. ORDEAL. Prof. BENJAMIN W. MCCREADY, M. D., Belle- vue Hospital Medical College, New York. OPHTHALMIA. Prof. ALFRED M. MAYER, Stevens Inst. of Tech- nology, Hoboken, N. J. Music (Theory of). Rev. FRANKLIN NOBLE. NAMES, NINEVEH, NORMANBY, MARQUIS OP, and other articles in biography and history. Rev. BERNARD O'REILLY, D. D. NEWMAN, JOHN HENRY, NICHOLAS, Popes, OBLATES, ORATORIANS, ORIGEN, and other articles in ecclesiastical history. Count L. F. DE POURTALES, Museum of Com- parative Zoology, Cambridge, Mass. PACIFIC OCEAN. V. PREOHT. MUSICAL Box. RICHARD A. PROCTOR, A. M., London. NEBULA, NEBULAR HYPOTHESIS, NEPTUNE, and other astronomical articles. Prof. A. RAUSCHENBUSCH, D. D., Rochester Theological Seminary, Rochester, N. Y. MtiNZER, THOMAS. Prof. CHARLES VALENTINE RILEY, State Ento- mologist, St. Louis, Mo. OAK APPLE. PHILIP RIPLEY. NAST, THOMAS, NEWSPAPERS (American), NORDHOFF, CHARLES, and other articles in biography. JOHN SAVAGE, Fordham, N. Y. O'BRIEN, WILLIAM SMITH. O'CURRY, EUGENE. Prof. PHILIP SCHAFF, D. D., Union Theological Seminary, New York. NEANDER, JOHANN AUGUST WILHELM. Prof. A. J. SCHEM. OLD CATHOLICS, and other articles in biography and history. J. G. SHEA, LL. D. NARRAGANSETTS, NATCHEZ, NEZ PERCES, ONONDAGAS, OSAGES, OTTAWAS, and other articles on American Indians. Prof. J. A. SPENCER, D. D., College of tho City of New York. MUHLENBERG, WlLLIAM AUGUSTUS. NEALE, JOHN MASON. ONDERDONK, HENRY USTICK. ONDERDONK, BENJAMIN TREDWELL. Prof. FRANK H. STOEER, College of Agricultu- ral Chemistry, Harvard University. NOMENCLATURE, CHEMICAL. Rev. WILLIAM L. SYMONDS, Portland, Me. MYSTERIES. Prof. GEORGE THUEBER. MUSHROOM, MYRTLE, NASTURTIUM, OAK, OLIVE, ORANGE, ORCHIDS, and other botanical articles. Prof. G. A. F. VAN RHYN, Ph. D. MYTHOLOGY, NETHERLANDS, LANGUAGE AND LITEEATUEK OP OSIRIS, and other archaeological, oriental and philological articles. I. DE VEITELLE. MURCIA, NUEVO LEON, OAJACA, PAEZ, JOSE ANTONIO, and other geographical articles, B. E. WELLS, Oswego, N. Y. OSWEGO. C. S. WEYMAN. MURILLO, BAKTOLOME EBTEBAN. OVERBECK, FRIEDRICH. OVERBECK, JOHANNES ADOLF. OVTD. PAINTING. H. WILLEY, New Bedford, Mass, NEW BEDFORD.
