Long Measure. 12 inches 1 foot. 3 feet 1 yard. 2 yards 1 fathom. 16-1/2 feet 1 rod. 4 rods 1 chain. 10 chains 1 furlong. 8 furlongs 1 mile. Square Measure. 9 sq. feet 1 sq. yard. 30-1/4 sq. yds. 1 sq. rod. 40 sq. rods 1 sq. rood. 4 sq. roods 1 sq. acre. 640 sq. acres 1 sq. mile. An acre is 209 feet square. Land Measure. 7.92 inches 1 link. 25 links 1 rod. 4 rods 1 chain. 80 chains 1 mile. Avoirdupois Weight. 16 drams 1 ounce. 16 ounces 1 pound. 25 pounds 1 quarter. 4 quarters 1 cwt. 20 cwt. (2,000 pounds) 1 ton. Apothecary's Weight. 20 grains 1 scruple. 3 scruples 1 dram. 8 drams 1 ounce. 12 ounces 1 pound. GLOSSARY. Adamantine--Having diamond luster. Adit--A horizontal tunnel from the surface draining a mine. Alluvium--Deposit by streams. Amalgamation--Combining mercury with another metal. Analysis--A chemical search whereby the nature (qualitative) and amount (quantitative) of the components of a substance are found out. Aqua regia--A mixture of 3 parts hydrochloric acid with 1 part strong nitric acid. Arenaceous--Sandy. Argentiferous--Silver-bearing. Argillaceous--Clay-bearing. Arrastra--A rotary and primitive mill. Assay--A test. Assay-ton--29.166 2-3 grammes. Auriferous--Gold-bearing. Bar--Obstruction in the bed of a river. Bar-diggings--Claims in the shallows of streams. Base Metals--Those not classed as precious. Batea--Mexican gold-washing dish. Battery--A set of stamps for crushing. Bed--A seam or deposit. Bed-rock--Solid stratum below porous material. Bench--Old river bed; also called a terrace. Booming--The sudden discharge of accumulated water. Bort--Black diamond. Calcite--Carbonate of lime. Canon--Pronounced canyon; a gorge. Carat--About 4 grains Troy. Cement--Compacted gravel. Color--A speck of gold. Country Rock--The rock enclosing a vein. Cradle--A mining apparatus; also called a rocker. Cupriferous--Copper-bearing. Decrepitate--Crackling when hot. Development--Work done in opening a mine. Dip--The inclination of a vein at right angles to its length. Dolly--A primitive stamp-mill. Drift--A horizontal gallery in a mine; or the rubbish left by the last ice age. Drifting--Driving a tunnel.