| A. Ca. | Arthur Cayley, LL.D., F.R.S.- See the biographical article, Cayley, Arthur.
| | Monge, Gaspard. |
| A. E. G | Rev. Alfred Ernest Garvie, M.A., D.D.- Principal of New College, Hampstead. Member of the Board of Theology and the Board of Philosophy, London University. Author of Studies in the inner Life of Jesus; &c.
| | Miracle. |
| A. E. S. | Arthur Everett Shipley, M.A., D.Sc., F.R.S.- Master of Christ's College, Cambridge. Reader in Zoology, Cambridge University. Joint-editor of the Cambridge Natural History.
| | Mesozoa. |
| A. F. P. | Albert Frederick Pollard, M.A., F.R.Hist.S.- Professor of English History in the University of London. Fellow of All Souls College, Oxford. Assistant Editor of the Dictionary of National Biography, 1893-1901. Lothian Prizeman (Oxford), 1892; Arnold Prizeman, 1898. Author of England under the Protector Somerset; Henry VIII.; Life of Thomas Cranmer; &c.
| | Morton, John. |
| A. Go.* | Rev. Alexander Gordon, M.A.- Lecturer on Church History in the University of Manchester.
| | Menius; Mennonites; Menno Simons; Morone. |
| A. G. D | Arthur George Doughty, M.A., Litt.D., C.M.G.- Dominion Archivist of Canada. Member of the Geographical Board of Canada. Author of The Cradle of New France; &c. Joint-editor of Documents relating to the Constitutional History of Canada.
| | Mercier, Honoré. |
| A. Ha. | Adolf Harnack.- See the biographical article, Harnack, Adolf.
| | Millennium; Montanism. |
| A. H.-S. | Sir A. Houtum-Schindler, C.I.E.- General in the Persian Army. Author of Eastern Persian Irak.
| | Meshed. |
| A. J. G. | Rev. Alexander James Grieve, M.A., B.D.- Professor of New Testament and Church History at the United Independent College, Bradford. Sometime Registrar of Madras University and Member of Mysore Educational Service.
| | Missions (in part). |
| A. J. L. | Andrew Jackson Lamoureux.- Librarian, College of Agriculture, Cornell University. Formerly Editor of the Rio News, Rio de Janeiro.
| | Mexico: Geography. |
| A. L. | Andrew Lang.- See the biographical article, Lang, Andrew.
| | Molière. |
| A. M. C. | Agnes Mary Clerke.- See the biographical article, Clerke, A. M.
| | Mouchez. |
| A. N. | Alfred Newton, F.R.S.- See the biographical article, Newton, Alfred.
| | Megapode; Merganser; Mocking Bird; Moor-Hen; Morillon; Motmot; Mouse-Bird. |
| A. Se.* | Adam Sedgwick, M.A., F.R.S.- Professor of Zoology at the Fellow, and formerly Tutor, Imperial College of Science and Technology, London. of Trinity College, Cambridge. Professor of Zoology in the University of Cambridge, 1907-1909.
| | Metamorphosis. |
| A. V. G. | Baron Alfred Von Gutschmid.- See the biographical article, Gutschmid, Alfred, Baron Von.
| | Moses of Chorene (in part). |
| A. Wa. | Arthur Waugh, M.A.- New College, Oxford. Newdigate Prize 1888. Author of Gordon in Africa; Alfred, Lord Tennyson. Editor of Johnson's Lives of the Poets; editions of Dickens, Tennyson, Arnold, Lamb; &c.
| | Morris, William. |