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LEFT jREGNAL YEARS 481 KEHAN 1836 a Registration Act was passed ap- plicable to England and Wales, which has buen amended by subsequent acts. In the United States, there is no national law on the subject, such regulations be- ing made by States, municipalities, or religious bodies. REGNAL YEARS, the years a sov- ereign has reigned, numbered succes- sively, and used for chronological pur- poses, as in the enumeration of acts of Parliament, The practice of dating a new reign from the day following the last of the late king's reign has generally been adopted since the reign of Richard II., but before this time a reign was generally considered to begin with some act of sovereignty. REGNAULT, ALEXANDRE GEORGES HENRI, a French painter; born in Paris, Oct. 30, 1843, the son of Henri Victor Regnault (q.v.). His aptitude for drawing manifested itself very early, and he was continually sketching the animals in the Jardin des Plantes. He studied art under Lamothe and Cabanel; and, after two unsuccess- ful attempts, gained the prix de Rome (the Rome prize) in 1866. He executed there a remarkable portrait of Madame Duparc, and his historical subject of "Automedon Breaking the Horses of Achilles," and drew on wood illustra- tions for Way's "Rome." In 1869 he painted an equestrian portrait of Gen- eral Prim, now in the Louvre, and in 1870 "The Execution Without Judgment Under the Moorish Kings of Granada'* to be found in the same collection. Other works of 1870 are "Judith" and "Salome." He returned to Paris on the outbreak of the Franco-Prussian War; and though exempt from military serv- ice, he volunteered as a private soldier, and was killed at Buzenval, Jan. 19, 1871. REGNAULT, HENRI VICTOR, a French scientist; born in Aix-la-Cha- pelle, Prussia, July 21, 1810. A shopman in a Paris bazaar, he entered the Poly- technic School, and, after the two years' course, came out as a mining engineer. He became a professor in Lyons, whence, in 1840, he was recalled to Paris as a member of the Academy of Sciences, in consequence of some important discov- eries in organic chemistry. He filled chairs in the Polytechnic School and the College of France, and became in 1854 director of the imperial porcelain manu- factory of Sevres. He devoted himself to the determination of important physi- cal data, the Royal Society of London awarded him their Rumford medal and the Copley medal (1869). He published an "Elementary Course in Chemistry" (1871). He died Jan. 20, 1878. REGULAR CLERGY, the term ap- plied in the Roman Catholic Church to priests who have taken the vows, and who are bound to follow the rules of some monastic order, as opposed to the secular clergy, that is parish priests, etc., not connected with any of the orders. REGULUS, a term in metallurgy, now used in a generic sense for metals in different stages of purity, but which still retain, to a greater or less extent, the impurities they contained in the state of ore. REGULUS, the star Alpha Leonis, the brightest in the constellation of the Lion. REGULUS, MARCUS ATTILIUS, a Roman general, celebrated for his pa- triotism and devotion in the service of his country. Made consul a second time about 256 B, c, with his colleague, Man- lius Vulso, he commanded in the first war against Carthage. Taken prisoner by the Carthaginians, he was sent to Rome with an embassy, that peace might be procured, and bound himself, by an oath, to return if the terms were rejected. He considered it his duty to advise the continuance of the war; which, being determined on, no entreaties could pre- vent him from fulfilling his solemn en- gagement; and the Carthaginians, on his return, put him to a cruel death. REGULUS, or RULE, ST., according to legend, a monk of Constantinople or Bishop of Patras, who in A. D, 347, came to Muckross or Kilrimont (afterward St. Andrews), bringing relics of St. Andrew to Scotland from the East. REGURGITATION, the flowing back into the vessels of the heart of the blood which had just left them. It is the re- sult of valvular disease of the heai-t. It is of three kinds: aortal, mitral, and tricuspid regurgitation. REHAN (originally Crehan), ADA, an American actress; born in Limerick, Ireland, April 22, 1860. In 1865 she came with her parents to the United States. She first appeared on the stage in Newark, N. J., when 14 years old. In 1879 she joined Augustin Daly's com- pany. She frequently played before London audiences, and also in France and in Germany. Miss Rehan created over 40 roles in comedy. Among her best knovn personations are Katherine, in "The Taming of the Shrew"; Rosa- lind, in "As You Like It"; Viola, in "Twelfth Night"; Maid Marian, in "The Foresters"; etc. She only acted occa- sionally after 1889. Died 1916.