Skip to content
Catholic Online Logo

A French mineralogist, b. 4 February, 1833, at Châteauneuf-sur-Cher; d. 6 July, 1894, in Paris. From 1872 he wan professor of minéralogy at the Ecole des Mines, from 1890 member of the Academy of Science. Mallard has accomplished much of importance in mineralogy by his untiring and successful research. Numerous scientific reports appeared year after year in the "Bulletin de la Société mineralogique de France" and in the "Annales des Mines," several also in the "Compt. Rend." By far the greater number of these discuss difficult problems in crystallography, especially the physical attributes of crystals. The so-called optical anomalies of some crystals he endeavoured to grasp clearly in their actual relationship and then to explain ingeniously by a hypothesis which supposes that the highly symmetrical form of these crystals is caused by a great number of smaller crystals with a smaller number of symmetrical planes, which are arranged in a certain manner. The best general explanation he advanced in his lecture "Crystallic Groupings" which appeared in the "Revue Scientifique" in 1887. His hypothesis found many defenders, and, of course, also many dissenters; especially his German colleagues drew him frequently into controversies. Equally known are Mallard's writings about isomorphism which he discovered in chlorates and nitrates, and about isomorphic mixtures, especially feldspars, the optical qualities of which he traced mathematically from the proportions in which the components were mixed. His reports about different crystallographical instruments, as well as those regarding the production of thin sections of crystals for microscopic study, are important for the science of crystallography. His investigations of the combustion of explosive gas mixtures, of mine explosions, and the safety lamp, have great scientific but even greater practical value. Worth mentioning is his participation in the geological cartographing of France. His chief work is the voluminous "Treatise on Geometrical and Physical Crystallography" (Paris, 1879 and 1884); the third volume has never appeared. His religious opinions were expressed by himself during a lecture in 1872: "Man has been created in the image of the Lord and therefore he is capable of penetrating by the power of his reason into the plans and thoughts of the Creator of all things, that must be his highest ambition here below." These words contain Mallard's programme of life during the following two decades.


More Encyclopedia

The Catholic Encyclopedia is the most comprehensive resource on Catholic teaching, history, and information ever gathered in all of human history. This easy-to-search online version was originally printed between 1907 and 1912 in fifteen hard copy volumes.

Catholic Encyclopedia

Designed to present its readers with the full body of Catholic teaching, the Encyclopedia contains not only precise statements of what the Church has defined, but also an impartial record of different views of acknowledged authority on all disputed questions, national, political or factional. In the determination of the truth the most recent and acknowledged scientific methods are employed, and the results of the latest research in theology, philosophy, history, apologetics, archaeology, and other sciences are given careful consideration.

No one who is interested in human history, past and present, can ignore the Catholic Church, either as an institution which has been the central figure in the civilized world for nearly two thousand years, decisively affecting its destinies, religious, literary, scientific, social and political, or as an existing power whose influence and activity extend to every part of the globe. In the past century the Church has grown both extensively and intensively among English-speaking peoples. Their living interests demand that they should have the means of informing themselves about this vast institution, which, whether they are Catholics or not, affects their fortunes and their destiny.

Copyright © Catholic Encyclopedia. Robert Appleton Company New York, NY. Volume 1: 1907; Volume 2: 1907; Volume 3: 1908; Volume 4: 1908; Volume 5: 1909; Volume 6: 1909; Volume 7: 1910; Volume 8: 1910; Volume 9: 1910; Volume 10: 1911; Volume 11: - 1911; Volume 12: - 1911; Volume 13: - 1912; Volume 14: 1912; Volume 15: 1912

Catholic Online Catholic Encyclopedia Digital version Compiled and Copyright © Catholic Online

Newsletters

Newsletter Sign Up icon

Stay up to date with the latest news, information, and special offers

Subscribe to Catholic OnlineYouTube Channel

the FEED
by Catholic Online

  • Can you answer these four challenging questions about Lent?
  • Palm Sunday HD Video
  • Daily Readings for Wednesday, February 10, 2016
  • Take this thought provoking Stations of the Cross survey
  • St. Scholastica: Saint of the Day for Wednesday, February 10, 2016
  • 10 important things to consider during Lent
  • Stations of the Cross - Fourth Station: Jesus meets his mother HD Video

Daily Readings

Reading 1, First Kings 8:22-23, 27-30
22 Then, in the presence of the whole assembly of Israel, Solomon stood ... Read More

Psalm, Psalms 84:3, 4, 5, 10, 11
3 Even the sparrow has found a home, the swallow a nest to place its ... Read More

Gospel, Mark 7:1-13
1 The Pharisees and some of the scribes who had come from Jerusalem ... Read More

Saint of the Day

Saint of the Day for February 9th, 2016 Image

St. Apollonia
February 9: St. Apollonia, who died in the year 249, was ... Read More