The testimony of Dr. Veron, who was manager of the Grand Opera during the most of the composer's brilliant career, is of great interest, as illustrating this trait of Meyerbeer's composition. He tells us in his "Memoires," before alluded to, that "Robert" was made and remade before its final production. The ghastly but effective color of the resuscitation scene in the graveyard of the ruined convent was a change wrought by a stage manager, who was disgusted with the chorus of simpering women in the original. This led Meyerbeer to compose the weird ballet music which is such a characteristic feature of "Robert le Diable." So, too, we are told on the same authority, the fourth act of "Les Huguenots," which is the most powerful single act in Meyerbeer's operas, owes its present shape to Nourrit, the most intellectual and creative tenor singer of whom we have record. It was originally designed that the St. Bartholomew massacre should be organized by _Queen Marguerite_, but Nourrit pointed out that the interest centering in the heroine, Valentine, as an involuntary and horrified witness, would be impaired by the predominance of another female character. So the plot was largely reconstructed, and fresh music written. Another still more striking attraction was the addition of the great duet with which the act now closes--a duet which critics have cited as an evidence of unequaled power, coming as it does at the very heels of such an astounding chorus as "The Blessing of the Swords." Nourrit felt that the parting of the two lovers at such a time and place demanded such an outburst and confession as would be wrung from them by the agony of the situation. Meyerbeer acted on the suggestion with such felicity and force as to make it the crowning beauty of the work. Similar changes are understood to have been made in "Le Prophete" by advice of Nourrit, whose poetical insight seems to have been unerring. It was left to Duprez, Nourrit's successor, however, to be the first exponent of _John of Leyden_. These instances suffice to show how uncertain and unequal was the grasp of Meyerbeer's genius, and to explain in part why he was so prone to gorgeous effects, aside from that tendency of the Israelitish nature which delights in show and glitter. We see something in it akin to the trick of the rhetorician, who seeks to hide poverty of thought under glittering phrases. Yet Meyerbeer rose to occasions with a force that was something gigantic. Once his work was clearly defined in a mind not powerfully creative, he expressed it in music with such vigor, energy, and warmth of color as can not be easily surpassed. With this composer there was but little spontaneous flow of musical thought, clothing itself in forms of unconscious and perfect beauty, as in the case of Mozart, Beethoven, Cherubini, Rossini, and others who could be cited. The constitution of his mind demanded some external power to bring forth the gush of musical energy.