Although Gluck's "Iphigénie" might rightfully claim to have perfected the French grand opera in its national sense, yet it was a difficult undertaking to gain recognition for this fact in Paris, and to produce there the work of a foreign, if not of an unknown composer. Du Rollet published a letter to D'Auvergne, one of the directors of the Grand-Opéra, in the "Mercure de France" (October, 1772), in which he acquaints him of Gluck's wish to produce his "Iphigénie" in Paris. He laid stress on Gluck's having preferred the French language and music to the Italian, and declared that his composition of Racine's masterpiece was altogether after the French taste; he hoped in this way to gain the favour of the public and the theatre management. As this met with no response, Gluck himself published a letter in the "Mercure" (February, 1773), in which, without undue submission, he reiterates the wish; he wastes great praise on J. J. Rousseau, who was destined to be the most determined opponent of the French language and music. At last Gluck succeeded in gaining the interest of the Dauphiness, Marie Antoinette, all difficulties were overcome, and in the autumn of 1773 Gluck went to Paris to put his opera in rehearsal.[75] Again hindrances were thrown in his way which it required all the force and vigour of his character to overcome. The hardest struggle was with the vocalists, male and female, and with the orchestra; they must be attached to him at all costs. But he was an implacable conductor,[76] and never gave way before a storm.[77] After six months rehearsing, "Iphigénie" was performed (February 14, 1774); the success of the first performance was not brilliant, but the second quite confirmed the victory. Gluck had succeeded (an important point in Paris) in raising public expectation to a high pitch {FRENCH OPERA.} (30) beforehand, and he found zealous supporters among the journalists, especially the Abbé Arnaud; the opposition engendered by the enthusiastic partisanship of his admirers was in his favour in so far that it prevented the interest of the public from becoming faint.[78]