Arrastra

Crude drag-stone mill for pulverizing ores such as those containing silver or gold or their compounds. See patio process.

Olson, Elder (james)

After receiving his Ph.D. from the University of Chicago in 1938, Olson taught for several years at the Armour Institute of Technology

Mitra, Ramon

Philippine politician (b. 1928, Palawan, Phil.—d. March 20, 2000, Manila, Phil.), was a prominent politician, a pro-democracy activist, and an outspoken critic of the 1966–86 regime of Philippine Pres. Ferdinand Marcos. After working as a journalist and diplomat, Mitra served in the House of Representatives in the 1960s and was elected to the Senate in 1971. After Marcos imposed martial law in the Philippines

Paulinus Of Nola, Saint

Paulinus became successively a Roman senator, consul, and governor of Campania, a region of southern Italy. Returning to Aquitaine he married and in 389 retired with his wife to Spain. The death of their only child, in 392, influenced

Pyrazine

Any of a class of organic compounds of the heterocyclic series characterized by a ring structure containing four atoms of carbon and two of nitrogen. The pyrazine ring is part of many polycyclic compounds of biological or industrial significance. The simplest member of the pyrazine family is pyrazine itself, a colourless, water-soluble solid with molecular formula

Gravel

Fragments in gravel range in size from pebbles

Gabinius, Aulus

As tribune in 67 BC Gabinius proposed a law that gave Pompey command of the Mediterranean and all the land within 50 miles (81 km) of its coast as a means of controlling the depredations of pirates. Another Gabinian measure checked the lending of money to foreign ambassadors at Rome. Its