The following tables give the equivalents of both the metric and common systems, and will be found convenient for reference:

Approximate Equivalent.

Accurate Equivalent.

1 inch................[length]

2 1/2 cubic centimeters...........

2.539

1 centimeter,........................

0.4 inch...............

0.393

1 yard...........................

1 meter................

0.914

1 meter (39.37 inches)......................

1 yard.................

1.093

1 foot..................

30 centimeters

30.479

1 kilometer (1,000 meters)..................

5/8 mile...................

0.621

1 mile..................

1 1/2 kilometers..............

1.600

1 gramme.................[weight]

15 1/2 grains..................

15.432

1 grain..................

0.064 gramme.............

0.064

1 kilogramme (1,000 grammes)..............

2.2 pounds avaoirdupos.............

2.204

1 pound avoirdupois....................

1/2 kilogramme.............

0.453

1 ounce avoirdupois (437 1/2 grains).......

28 1/3 grammes..................

28.349

1 ounce troy, or apothecary (480 grains).....

31 grammes................

31.103

1 cubic centimeter..........[bulk]

1.06 cubic inch

0.060

1 cubic inch

16 1/3 cubic centimeters

16.386

1 liter (1,000 cubic centimeters).............

1 United States standard quart

0.946

1 united states quart........................

1 liter......................

1.057

1 fluid ounce

29 1/2 cubic centimeters........

29.570

1 hectare (10,000 square meters) [surface].

2 1/2 acres..................

2.471

1 acre ........................................................

0.4 hectare...............

0.40

It may not be generally known that we have in the nickel five-cent piece of our coinage a key to the tables of linear measures and weights. The diameter of this coin is two centimeters, and its weight is five grammes. Five of them placed in a row will, of course, give the length of the decimeter; and two of them will weigh a decagram. As the kiloliter is a cubic meter, the key to the measure of length is also the key to the measure of capacity. Any person, therefore, who is fortunate enough to own a five-cent nickle, may carry in his pocket the entire metric system of weights and measures.