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
Physicist, born at Forli, in the Romagna, 21 June, 1811; died at Ardenza, near Leghorn, 25 July, 1868. He studied mathematics at the University of Bologna, receiving his doctorate in 1829. Then he went to the Paris Ecole Polytechnique for two years as a foreign student. In 1831 he returned to Forli and began to experiment in physics. In taking up the Voltaic pile he took sides against Volta's contact theory of electricity. He remained at Florence until his father's death in 1834, when he went to Ravenna and later to Pisa. His study of the Voltaic battery led him to announce the law that the decomposition in the electrolytic cell corresponds to the work developed in the elements of the pile. From the external effect it became possible to calculate the material used up in the pile. In 1837 he was invited by his friend Buoninsegni, president of the Ravenna Hospital, to take charge of its chemical laboratory and at the same time assume the title and rank of professor of physics at the college. There he did most excellent work and soon became famous. Arago, hearing of the vacancy in the chair of physics at the University of Pisa, wrote to Humboldt asking him to recommend Matteucci to the Grand-Duke of Tuscany. This application was successful and there at Pisa he continued his researches. Beginning with Arago's and Faraday's discoveries he developed by ingenious experiments our knowledge of electrostatics, electro-dynamics, induced currents, and the like, but his greatest achievements however were in the field of electro-physiology, with frogs, torpedoes, and the like.
He was also successful as a politician. In 1848 Commissioner of Tuscany to Charles Albert; sent to Frankfort to plead the cause of his country before the German Assembly; 1849 in Pisa, director of the telegraphs of Tuscany; 1859 provisional representative of Tuscany at Turin, and then sent to Paris with Peruzzi and Neri Corsini to plead the annexation of Piedmont; 1860 Inspector-General of the telegraph lines of the Italian Kingdom. Senator at the Tuscan Assembly in 1848, and again in the Italian Senate in 1860; Minister of Public Instruction, 1862, in the cabinet of Rattazzi. He won the Copley medal of the Royal Society of London, and was made corresponding member of the Paris Academy of Sciences in 1844. He published a great deal in English, French, and Italian journals of science. His larger works were:
WILLIAM FOX