Troy Weight - 24 grains make 1 pennyweight, 20 pennyweights make 1 ounce. By this weight, gold, silver and jewels only are weighed. The ounce and pound in this are same as in Apothecaries' weight.

Apothecaries' Weight - 20 grains make 1 scruple, 3 scruples make 1 dram, 8 drams make 1 ounce, 12 ounces make 1 pound.

Avoirdupois Weight - 16 drams make 1 ounce, 16 ounces make 1 pound, 25 pounds make 1 quarter, 4 quarters make 1 hundredweight, 2000 pounds make 1 ton.

Dry Measure - 2 pints make 1 quart, 8 quarts make 1 peck, 4 pecks make 1 bushel, 36 bushels make 1 chaldron.

Liquid or Wine Measure - 4 gills make 1 pint, 2 pints make 1 quart, 4 quarts make 1 gallon, 311/2 gallons make 1 barrel, 2 barrels make 1 hogshead.

Time Measure - 60 seconds make 1 minute, 60 minutes make 1 hour, 24 hours make 1 day, 7 days make 1 week, 4 weeks make 1 lunar month, 28,.29, 30 or 31 days make 1 calendar month (30 days make 1 month in computing interest,) 52 weeks and 1 day, or 12 calendar months make 1 year; 365 days, 5 hours, 48 minutes and 49 seconds make 1 solar year.

Circular Measure - 60 seconds make 1 minute, 60 minutes make 1 degree, 30 degrees make 1 sign, 90 degrees make 1 quadrant, 4 quadrants or 360 degrees make 1 circle.

Long Measure - Distance - 3 barleycorns 1 inch, 12 inches 1 foot, 3 feet 1 yard, 51/2 yards 1 rod, 40 rods 1 furlong, 8 furlongs 1 mile.

Cloth Measure - 21/4 inches 1 nail, 4 nails 1 quarter, 4 quarters 1 yard.

Miscellaneous - 3 inches 1 palm, 4 inches 1 hand, 6 inches 1 span, 18 inches 1 cubit, 21.8 inches 1 Bible cubit, 21/2 feet, 1 military pace.

Square Measure - 144 square inches 1 square foot, 9 square feet 1 square yard, 301/4 square yards 1 square rod, 40 square rods, 1 rood, 4 roods 1 acre.

Surveyor's Measure - 7.92 inches 1 link, 25 links 1 rod, 4 rods 1 chain, 10 square chains or 160 square rods 1 acre, 640 acres 1 square mile.

Cubic Measure - 1,728 cubic inches 1 cubic foot, 27 cubic feet 1 cubic yard, 128 cubic feet 1 cord (wood) 40 cubic feet 1 ton (shipping), 2,150.42 cubic inches 1 standard bushel, 268.8 cubic inches 1 standard gallon, 1 cubic foot four fifths of a bushel.

Metric Weights - 10 milligrams 1 centigram, 10 centigrams 1 decigram, 10 decigrams 1 gram, 10 grams 1 dekagram, 10 dekagrams 1 hektogram, 10 hektograms 1 kilogram.

Metric Measures - (One milliliter - Cubic centimeter.) - 10 milliliters 1 centiliter. 10 centiliters 1 deciliter, 10 deciliters 1 liter, 10 liters 1 dekaliter, 10 dekaliters 1 hektoli-ter, 10 hektoliters 1 kiloliter.

Metric Lengths - 10 millimeters 1 centimeter, 10 centimeters 1 decimeter, 10 decimeters 1 meter, 10 meters 1 dekameter, 10 dekameters 1 hektometer, 10 hektometers 1 kilometer.