Grimm had attacked French music, Rousseau supported his thesis by a _Lettre sur la Musique_.
It was the moment of the great quarrel between the Parliament and the clergy.

"When my letter appeared, there was no more excitement save against me," says Rousseau; "it was such that the nation has never recovered from it.

When people read that this pamphlet probably prevented a revolution in the state, they will fancy they must be dreaming." And Grimm adds in his correspondence: "The Italian actors who have been playing for the last ten months on the stage of the Opera de Paris and who are called here bouffons, have so absorbed the attention of Paris that the Parliament, in spite of all its measures and proceedings which should have earned it celebrity, could not but fall into complete oblivion.

A wit has said that the arrival of Manelli saved us from a civil war; and Jean Jacques Rousseau of Geneva, whom his friends have dubbed the citizen of citizens (_le citoyen par excellence_), that eloquent and bilious foe of the sciences, has just set fire to the four corners of Paris with a _Lettre sur la Musique,_ in which he proves that it is impossible to set French words to music.

.