The metric system is based on the meter, which, according to the U. S. Coast and Geodetic Survey Report of 1884, is equal to 39.370432 inches. The value commonly used is 39.37 inches, and is authorized by the U. S. government. The meter is denned as one ten-millionth the distance from the pole to the equator, measured on a meridian passing near Paris.

There are three principal units - the meter, the liter (pronounced lee-ter), and the gram, the units of length, capacity, and weight, respectively. Multiples of these units are obtained by prefixing to the names of the principal units the Greek words deca (10), hecto (100), and kilo (1,000); the submulti-ples, or divisions, are obtained by prefixing the Latin words deci (1/10), centi (1/100), and milli (1/1000). These prefixes form the key to the entire system. In the following tables, the abbreviations of the principal units of these submultiples begin with a small letter, while those of the multiples begin with a capital letter; they should always be written as here printed.

## Measures Of Length

 Name. Meters. U. S. In. Feet. Millimeter (mm.) = .001 = .039370 = .003281 Centimeter (cm.) = .010 = .393704 = .032809 Decimeter (dm.) = .100 = 3.937043 = .328087 Meter (m.) = 1.000 = 39.370432 = 3.280869 Decameter (Dm.) = 10.000 = 32.808690 Hectometer (Hm.) = 100.000 = 328.086900 Kilometer (Km.) = 1,000.000 = .621 mi. = 3,280.869000 Myriameter (Mm.) = 10,000.000 - 6.214 mi. = 32,808.690000

The centimeter, meter, and kilometer are the units in practical use, and may be said to occupy the same posit ion in the metric system as do inches, yards, and miles in the U. S. and English system of measurement.

## Measures Of Area

 Name. Sq. Met. Sq. In. Sq.Ft. Acres. Sq. millimeter (mm.2) = .0000010= .001550 Sq. centimeter (cm.2) = .0001000= .155003 =.00107641 Sq. decimeter (dm.2) = .0100000= 15.5003 =.10764100 Sq. meter, or centare (m.2, or ca.) = 1.000000= 1,550.03 = 10.764100 =.000247 Sq. decameter, or are (Dm.2, or A.) = 100.0000= 155,003 =1,076.4101 = .024710 Hectare =10,000.00 =107,641.01 = 2.47110 Sq. kilometer = .3861099 sq. mi. =10,764,101 = 247.110 Sq. myriameter = 38.61090 sq. mi. =24,711.0