Pierre

Stone, Masonry. Stone (disease)—Pierre de taille. Squared stone.—Pierre infernale. Nitrate of silver—Pierre de touche. Touchstone, criterion—Pierre carrée (taillée). Squared stone.—Pierre d’achoppement. Stumbling-block. —Pierre d’appareil. Ashlar.—Pierre brute. Unhewn stone. Pierre lithograph i que. Lithographic stone.—Pierre ponce. Pumice-stone.—Pierre-plate. Shaped stone.— Pierre angulaire. Corner-stone.—Pierre a l’huile. Oilstone.—Pierre 4 a i guiser. Grindstone.—A pierre fendre. Extremely hard (of frost)—Pierre a briquet. Flint.—Pierre a fusil. Gun flint—Pierre spéculaire. Mica.—Pierre d’aigle. Iron trioxide [p.434]