Ressources minérales des États-Unis, 1914--partie II--non-métaux . ndstone comprend celle de grès broyé dans le sable et utilisée dans la fabrication du verre et comme sable de moulage. La production de ces matériaux est décrite dans d'autres chapitres dans Ressources minérales. UNITÉ DE MESURE. En raison de la variété d'utilisations à laquelle la pierre est mise, il y a une unité de mesure norégculaire employée par le quarryman, la stoneétant vendue par la cour cubique, pied cube, tonne, cordon, perchaude, tige, squarefoot, cour carrée, carré, ou autre unité. La construction et la monumentale, en particulier le produit habillé, est habituellement vendue

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Mineral Resources of the United States, 1914--Part II--Nonmetals . ndstone include that of sandstone crushed into sand and used inthe manufacture of glass and as molding sand. The production ofthese materials is set forth in other chapters in Mineral Resources. UNIT OF MEASUREMENT. Owing to the variety of uses to which stone is put, there is noregular unit of measurement employed by the quarryman, the stonebeing sold by the cubic yard, cubic foot, ton, cord, perch, rod, squarefoot, square yard, square, or other unit. Building and monumentalstone, especially the dressed product, is usually sold by the cubicfoot or the cubic yard, although this unit varies with the class ofstone and with the locality. A large quantity of the rough stoneis sold by the perch, cord, or ton. Rubble and riprap, includingstone for such heavy masonry as breakwater and jetty work, aregenerally sold by the cord or ton. Fluxing stone and stone for chem-ical use—as for alkali works, sugar factories, carbonic acid plants, GEOLOGICAL SURVEY MINER«L RESOURCES, 1914, PART II PLATE. YEARDIAGRAM SHOWING PRODUCTION OF STONE IN THE UNITED STATES FROM 1880 TO 1914, INCLUSIVE. STONE. 821 and paper mills—are sold by the long ton. Flagstone and curbstoneare sold by the square yard or the square foot, the thickness beingvariable and dependent on the orders received. Granite pavingblocks are sold invariably by the number of blocks, but the blocksare not of uniform size, the value depending on the size and the labornecessary to cut the block into the shape desired. Other pavingmaterial is sold by various units, such as the ton or cubic yard.Crushed stone is reported as sold by the cubic yard or ton, the shortton being more generally used. The perch is legally denned in many older States as 24f cubic feet;in some States, and even within a single State, it varies from 16ithrough 20, 22, 25, to 27 cubic feet, and in others it is defined as equiv-alent to 2, 200, 2, 500, 2, 700, 2, 800, and 3, 000 pounds. The cord

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