MEASURES OF WEIGHT.

810. The Gram is the unit of weight, and equal to the weight of a cube of distilled water, the edge of which is one-hundredth of a meter, equal to 15.432 Troy grains.

The Kilogram, or Kilo, is the unit of common weight in trade and is a trifle less than 2 lb. Avoirdupois.

The Tonneau is used for weighing very heavy articles, and is about 204 lb. more than a common ton.

811. Units of the Common System may be 'readily changed to units of the Metric System by the aid of the following

the Library on or before the last date stamped below.

A fine of five cents a day is incurred by retaining it beyond the specified time.

Please return promptly.