 Theorists like Père André, author of an "Essai sur le Beau" and Abbé Pluche, of "Le Spectacle de la Nature" fame, were also among the conservative.There continued to be heated controversy with each new Rameau opera in the 1730s, reaching a peak with the premiere of "Dardanus" in 1739.Thereafter, it died down as Rameau's reputation became more established, but there were still hints of the dispute as late as the 1750s.