ed water at its maximum density.

The decimal subdivisions of each of the units are designated by the
Latin prefixes _milli_ = 1/1000; _centi_ = 1/100; _deci_ = 1/10; the
multiples of each unit by the Greek prefixes _deka_ = 10; _hecto_ = 100;
_kilo_ = 1000; _myria_ = 10,000.

For a comparison of the values of some of the more frequently employed
expressions of the Metric System and the Imperial System, the following
may be found convenient for reference:

~Length:~

1 millimetre (= 1 mm.) = 1/25 of an inch.

1 centimetre (= 1 cm.) = 2/5 of an inch.

1 inch (1") = 25 millimetres or 2-1/2 centimetres.

~Mass:~

1 milligramme (= 1 mg.) = 0.01543 grain (or approximately
1/64 grain).

1 gramme (= 1 g.) = 15.4323 grains.

1 "kilo" or kilogramme (= 1 kgm.) = 2 pounds, 3-1/4 ounces
avoirdupois.

1 pound avoirdupois (= 1 lb.) = 453.592 grammes.

1 ounce avoirdupois (= 1 oz.) = 28.35 grammes.

1 grain = 0.0648 gramme or 64.8 milligrammes.

~Capacity:~

1 cubic centimetre (= 1 c.c.) = 16.9 minims imperial
measure.

1 litre (= 1 _l._) = 35.196 fluid ounces imperial measure.

1 fluid ounce imperial measure (= 1 [Symbol: ounce]) =
28.42 cubic centimetres.

1 pint imperial measure (= 1 O.) = 568.34 cubic centimetres.

1 gallon imperial measure (= 1 C.) = 4.546 litres, or 10
pounds avoirdupois, of pure water at 62 deg. F. and under an
atmospheric pressure of 30 inches of mercury.

FACTORS FOR CONVERTING FROM ONE SYSTEM TO THE OTHER.

To convert grammes into grains x 15.432.
To convert grammes into ounces avoirdupois x 0.03527.
To convert kilogrammes into pounds x 2.2046.
To convert cubic centimetres into fluid ounces imperial x 0.0352.
To convert litres into fluid ounces imperial x 35.2.
To convert metres into inches x 39.37.
To convert grains into grammes x 0.0648.
To convert avoirdupois ounces into grammes x 28.35.
To convert troy ounces into grammes x 31.104.
To convert fluid ounces into cubic centimetres x 28.42.
To convert pints into litres x 0.568.
To convert inches into metres x 0.0254.

TABLE FO