In 1850, while playing in Paris, he decided to retire, and to turn over his theatre and tricks to one Hamilton. A contemporary clipping, taken from an English newspaper of 1848, goes to prove that Hamilton was an Englishman who entered Robert-Houdin's employ. Hamilton signed a dual contract, agreeing to produce Robert-Houdin's tricks as his acknowledged successor and to marry Robert-Houdin's sister, thus keeping the tricks and the theatre in the family. During the next two years Robert-Houdin spent part of his time instructing his brother-in-law in all the mysteries of his art. In July, 1852, he played a few engagements in Germany, including Berlin and various bathing resorts, and then formally retired to his home at St. Gervais. Here he continued to work along mechanical and electrical lines, and in 1855 he again came into public notice, winning awards at the Exhibition for electrical power as applied to mechanical uses. In 1856, according to his autobiography, he was summoned from his retirement by the Government to make a trip to Algeria and there intimidate revolting Arabs by the exhibition of his sleight-of-hand tricks. These were greatly superior to the work of the Marabouts or Arabian magicians, whose influence was often held responsible for revolts. What Robert-Houdin received for performing this service is not set forth in any of his works. He spent the fall of 1856 in Algeria. [Illustration: Bas-relief on Robert-Houdin tombstone. From a photograph taken by the author, especially for this work, and now in the Harry Houdini Collection.] From the date of his return to St. Gervais to the time of his death, June 13th, 1871, Robert-Houdin devoted his energies to improving his inventions and writing his books, though, as stated before, it was generally believed by contemporary magicians that in the latter task he entrusted most of the real work to a Parisian journalist whose name was never known. He was survived by a wife, a son named Emile, and a step-daughter. Emile Houdin managed his father's theatre until his death in 1883, when the theatre was sold for 35,000 francs. The historic temple of magic still stands under the title of "Théâtre Robert-Houdin," under the management of M. Melies, a maker of motion picture films. [Illustration: The last photograph taken of Robert-Houdin and used as the frontispiece for the original French edition of his "Memoirs," published in 1868.] During my investigations in Paris, I was shocked to find how little the memory of Robert-Houdin was revered and how little was known of France's greatest magician. In fact, I was more than once informed that Robert-Houdin was still alive and giving performances at the theatre which bears his name.