He returned to Paris in 1811, where he found great changes. Mehul and Cherubini, disgusted with the public, kept an obstinate silence; and Nicolo was not a dangerous rival. He set to work with fresh zeal, and one of his most charming works, "Jean de Paris," produced in 1812, was received with a storm of delight. This and "La Dame Blanche" are the two masterpieces of the composer in refined humor, masterly delineation, and sustained power both of melody and construction. The fourteen years which elapsed before Boieldieu's genius took a still higher flight were occupied in writing works of little value except as names in a catalogue. The long-expected opera "La Dame Blanche" saw the light in 1825, and it is to-day a stock opera in Europe, one Parisian theatre alone having given it nearly 2,000 times. Boieldieu's latter years were uneventful and unfruitful. He died in 1834 of pulmonary disease, the germs of which were planted by St. Petersburg winters. "Jean de Paris" and "La Dame Blanche" are the two works, out of nearly thirty operas, which the world cherishes as masterpieces. II. Daniel Francois Esprit Auber was born at Caen, Normandy, January 29, 1784. He was destined by his parents for a mercantile career, and was articled to a French firm in London to perfect himself in commercial training. As a child he showed his passion and genius for music, a fact so noticeable in the lives of most of the great musicians. He composed ballads and romances at the age of eleven, and during his London life was much sought after as a musical prodigy alike in composition and execution. In consequence of the breach of the treaty of Amiens in 1804, he was obliged to return to Paris, and we hear no more of the counting-room as a part of his life. His resetting of an old libretto in 1811 attracted the attention of Cherubini, who impressed himself so powerfully on French music and musicians, and the master offered to superintend his further studies, a chance eagerly seized by Auber. To the instruction of Cherubini Auber owed his mastery over the technical difficulties of his art. Among the pieces written at this time was a mass for the Prince of Chimay, of which the prayer was afterward transferred to "Masaniello." The comic opera "Le Sejour Militaire," produced in 1813, when Auber was thirty, was really his debut as a composer. It was coldly received, and it was not till the loss of private fortune set a sharp spur to his creative activity that he set himself to serious work. "La Bergere Chatelaine," produced in 1820, was his first genuine success, and equal fortune attended "Emma" in the following season.