Two days later Napoleon, by means of unworthy artifices, hurried the Austrian plenipotentiaries into signing the treaty of peace at Schonbrunn.

Various artifices are employed to denote the end of the reaction.

This notion is fundamental in the present theory because we will find that one of the most valuable artifices for finding invariants of a single quantic is first to find simultaneous invariants of several different quantics, and subsequently to make all the quantics identical.

Cardinal Siffrein, who is known as the Abbe Maury (1746-1817), resumed all the known artifices of sermon-style in a volume which has a permanent historical value, the well-known Essai sur l'eloquence de la chaire (1810); he was himself rather a fiery politician than a persuasive divine.

To Lagrange, perhaps more than to any other, the theory of differential equations is indebted for its position as a science, rather than a collection of ingenious artifices for the solution of particular problems. To the calculus of finite differences he contributed the beautiful formula of interpolation which bears his name; although substantially the same result seems to have been previously obtained by Euler.