BROOKL. 
THE METRIC SYSTEM. ’ 
Units. THE MOST COMMONLY USED DIVISIONS AND MULTIPLES, 
Centimeter (cm), 1/100 meter; J/limeter (mm), 
1/1000 meter; Jficron (u), 1/1000 millimeter. The 
micron is the unit in micrometry. 
Kilometer, 1000 meters; used in measuring roads and othe 
long distances. 5 
Milligram (mg), 1/1000 gram. 
THE METER, for 
LENGTH..... 
THE GRAM, for 
WEIGHT 3.50 
groceries, etc. 
Tue Liter, for ( Cubic Centimeter (cc), 1/1000 liter. This is more 
CAPACITY ....: | common than the correct form, Milliliter. 
Divisions of the wnits are indicated by Latin prefixes: deci, 1/10; cent, 
1/100; milli, 1/1000. 
Multiples are designated by Greek prefixes: deka, 10 times; hecto, 100 
times; £2/0, 1000 times; 7zyvZa, 10,000 times. 
TABLE OF METRIC AND ENGLISH MEASURES. 
METER = 100 centimeters, 1000 millimeters, 1,000,000 microns, 39.3704 
inches. 
Millimeter (mm) = 1000 microns, 1/10 millimeter, 1/1000 meter, 1/25 inch, 
approximately. 
MICRON (sz) (unit of measure in micrometry)=1/1000 mm, 1/1000000 me- 
ter (0.000039 inch), 1/25000 inch, approximately. 
Inch (in.) = 25.399772 mm (25.4 mm, approx.). 
LITER = 1000 milliliters or 1000 cubic centimeters, I quart (approx.). 
Cubic centimeter (cc or cctm) = 1/1000 liter. 
Fluid ounce (8 fluidrachms) = 29.578 cc (30 cc, approx.). 
GRAM = 15.432 grains. 
Kilogram (kilo) = 2.204 avoirdupois pounds (2} pounds, approx.). 
Ounce Avoirdupois (4374 grains) = 28.349 grams ) (30 grams, 
Ounce Troy or Apothecaries’ (480 grains) = 31.103 grams) approx.). 
TEMPERATURE. 
To change Centigrade to Fahrenheit: (C. x $)-+32 =F. For example, to | 
find the equivalent of 10° Centigrade, C, = 10°, (10° x 3) + 32 = 50° F. 
To change Fahrenheit to Centigrade: (F.— 32°) X = C. Forexample,to 
reduce 50 Fahrenheit to Centigrade, F. = 50°, and (50°— 32°) X § = 10°C.; 
or — 40° Fahrenheit to Centigrade, F. = — 40°, (— 40°— 32°) = — 72°, 
whence — 72° Xx 8 = — 40°C. ’ 
—From ‘The Microscope” (by S. H. Gage) by permission, — 
NORMAN TA 
BROOKLYN erTANic GARDEN 
N,N. Y. 
Kilogram, 1000 grams, used for ordinary masses, like © 
