Friedrich Bernard Christian Maassen
United Sees of Macerata and Tolentino
Vicariate Apostolic of Mackenzie
Marie-Edmé-Patrice-Maurice de MacMahon
Joseph-Anna-Marie de Moyria de Mailla
François-Pierre-Gonthier Maine de Biran
Françoise, Marquise de Maintenon
Joseph-Marie, Comte de Maistre
Marcellinus of Civezza, O.F.M.
Margaret of the Blessed Sacrament
Prefecture Apostolic of Mariana Islands
Congregation of the Missionaries of Mariannhill
Sts. Maris, Martha, Audifax, and Abachum
Lucius Perpetuus Aurelianus Marius Maximus
Vicariate Apostolic of Marquesas Islands
Moral and Canonical Aspect of Marriage
Diocese of Marseilles (Massilia)
Vicariate Apostolic of the Marshall Islands
Diocese of Marsico Nuovo and Potenza
Luigi Ferdinando, Count de Marsigli
Missionaries of the Company of Mary
Servants of Mary (Order of Servites)
Society of Mary (Marist Fathers)
St. Mary Frances of the Five Wounds of Jesus
Richard Angelus a S. Francisco Mason
Devises and Bequests for Masses (United States)
Feast of the Maternity of the Blessed Virgin Mary
Marcus Aurelius Valerius Maximianus
Caius Julius Verus Maximinus Thrax
Prefecture Apostolic of Mayotte, Nossi-Bé, and Comoro
Charles Joseph Eugene de Mazenod
Abbey and Congregation of Melk
Vicariate Apostolic of Méndez and Gualaquiza
Francisco Sarmiento de Mendoza
Corporal and Spiritual Works of Mercy
Sisters of Mercy of St. Borromeo
Frédéric-François-Xavier Ghislain de Mérode
Delegation Apostolic of Mesopotamia, Kurdistan, and Armenia
Metal-Work in the Service of the Church
Prince Klemens Lothar Wenzel von Metternich
Francis, Joseph, and Paul Mezger
Military Orders of St. Michael
Giovanni Francesco Pico della Mirandola
Congregation of the Sisters of Misericorde
Prefecture Apostolic of Misocco and Calanca
Congregation of Priests of the Mission
Congregation of Missionaries of St. Charles Borromeo
Missionaries of St. Francis de Sales of Annecy
Missionary Society of St. Paul the Apostle
Mission Indians (of California)
Catholic Indian Missions of Canada
Catholic Indian Missions of the United States
François-Napoléon-Marie Moigno
Diocese of Molfetta, Terlizzi, and Giovinazzo
Jean-Baptiste Poquelin Molière
Principality and Diocese of Monaco
Canonical Erection of a Monastery
Monophysites and Monophysitism
Monothelitism and Monothelites
Montagnais Indians (Chippewayans)
Charles-Forbes-René, Comte de Montalembert
Marquis de Louis-Joseph Montcalm-Gozon
Diocese of Monterey and Los Angeles
Charles-Louis de Secondat, Baron de Montesquieu
Anne, First Duke of Montmorency
Alexis-François Artaud de Montor
Antoine-Jean-Baptiste-Robert Auget, Baron de Montyon
Dioceses of Mostar and Markana-Trebinje
Feast of the Most Pure Heart of Mary
Toribio de Benavente Motolinia
Congregations of Mount Calvary
Feast of Our Lady of Mount Carmel
Karl Ernst, Freiherr von Moy de Sons
Johann Chrysostomus Wolfgang Amadeus Mozart
St. Clair Augustine Mulholland
Baron Eligius Franz Joseph von Münch-Bellinghausen
Archdiocese of Munich-Freising
Moravian astronomer, born at Mederizenhi in Moravia, 20 Aug., 1719, died at Heidelberg, 16 April, 1783. He entered the Society of Jesus at Mannheim on 26 Sept., 1745, and after completing his studies taught the humanities for some tirne at Aschaffenburg. He likewise cultivated his taste for mathematics, and later was appointed professor of mathematics and physics in the University of Heidelberg. In 1755 he was invited by the Elector Palatine Charles Theodore to construct and take charge of astronomical observatory at Mannheim. Here as well as at Schwetzingen, where he had also built an observatory, he carried on his observations which led to numerous memoirs, some of which were published in the "Philosophical Transactions" of London. One of his observations, recorded in the "Tables d'aberration et de mutation" (Mannheim, 1778) of his assistant Mesge, gave rise to much discussion. He claimed to have discovered that many of the more conspicuous stars in the southern heavens were surrounded by smaller stars, which he regarded as satellites. His contemporaries, including Herschel and Schröter, who were provided with much more powerful telescopes, failed to verify his observations. Mayer, however, defended their reality and replied to one of his critics, the well-known astronomer Father Höll, in a work entitled "Gründliche Vertheidigung neuer Beubachtungen von Fixstern-trabanten welche zu Mannheim auf der kurfürstl. Sternwarte endecket wordern sind", (Mannheim, 1778). In the following year he published a Latin work on the same subject. The observations, which were made in good faith, were evidently due to an optical illusion. Mayer spent some time at Paris in the interests of his science, and visited Germany in company with Cassini. Upon the invitation of Empress Catherine of Russia, he went to St. Petersburg to observe the transit of Venus in 1769. He was a member of numerous learned societies, including those of Mannheim, Munich, London, Bologna Göttingen, and Philadelphia. He published a number of memoirs, among which may be mentioned "Basis Palatina" (Mannheim, 1763), "Expositio de transitu Veneris" (St. Petersburg, 1769), "Pantometrum Pacechianum, seu instrumentum novum pro elicienda ex una statione distantia loci inaccessi" (Mannheim, 1762); "Nouvelle méthode pour lever en peu de temps et à peu de frais une carte générale et exacte de toute la Russie" (St. Petersburg, 1770); "Observations de la Comète de 1781" in the "Acts Acad. Petropolit." (1782), etc.
HENRY M. BROCK