to keep him firm; at any rate, while she lived he declined all Frederic's invitations, and declared his tie of friendship with the "divine Emily" paramount to every other. Voltaire and madame du Châtelet had agreed to vary their solitude at Cirey by visits to the metropolis. The leisure afforded by the seclusion of the country was congenial to labour. Far from the society and interruptions of Paris, they could both devote their whole minds to the subjects on which they were occupied; but they found difficulty in getting books. It was impossible at a distance from the capital for Voltaire to have access to the state papers necessary for the historical works he had in hand, or for the lady to keep up that communication with men of letters which, in matters of science particularly, is necessary to any one ambitious of extending and confirming discoveries. Yet the change was to be regretted. The vivacity of Voltaire's temper had caused him to be disturbed by the attacks of his enemies in his retirement. In the thick of society these attacks were more multifarious and stinging; and added to this, his reputation in the capital for a wit, could only be kept up by a sort of small money of authorship, so to speak, which frittered away the treasures of his mind. The death of the emperor Charles VI. plunged Europe in war. France interfered to cause the elector of Bavaria to be chosen emperor, and attacked Maria Theresa of Austria, daughter of Charles VI. The king of Prussia, a potentate who had not yet figured in the wars of Europe, desirous of taking advantage of the distressed state of the empire, seized on Silesia. Twice Voltaire was employed by his court to sound the intentions of his royal correspondent, and to influence him to ally himself with France. The first mission of this sort that he undertook was at the request of cardinal Fleuri.