Plata
RIO DE LA, River of Silver; a body of water which extends for more than 200 miles between the Argentine Republic and Uruguay, and is not, strictly speaking, a river, but rather an estuary, formed by the junction of the great rivers Paraná and Uruguay. It flows into the Atlantic between Cape St. iridium, is unalterable in the air, disknown substance excepting osmium and solves slowly in nitromuriatic acid, but is not attacked by any single acid. It is used extensively in the manufacture of expensive jewelry, and delicate instruments. During and after the World War (1914-1918) it ranged in value from $120 to $150 per ounce.