BOTANIC MATERIA MEDICA. II 
Example: too milliliters divided by 32, equals 3 fluid 
ounces and 1 fluid drachm that in this rule, as in the 
rule for the conversion of grams into ounces, it is 
assumed that 4 grams or 4 milliliters are the equivalents 
respectively of 1 drachm and 1 fluid drachm. 
‘If greater accuracy is desired,add 8 per cent; 
3 fluid ounces and 1 drachm plus 8 per cent 
equals 3 fluid ounces and 3 drachms. The 
true equivalent is 3.38 fluid ounces, 
TO CONVERT FEET INTO METERS, 
Multiply the number of feet by 3, and divide 
the result by ro. | 
Example: 15 feet multiplied by 3, equals 45 divided 
by 10 equals 4.5, the number of meters equal to 15 feet. 
If greater accuracy is desired, add 1.5 per 
cent; the result will then be 4.567 meters, The 
true equivalent is 4.571 meters. 
TO CONVERT METERS INTO FEET. 
Multiply by 40 and divide by 12. 
Example: 5 meters multiplied by 40, equals 200; 
divided by 12, the result is 16.6 feet as the equivalent of 
5 meters. 
If greater accuracy is desired, deduct 1.5 per 
cent: the result will be 16.36 feet. The true 
equivalent is 16.40 feet. 
- TO CONVERT METERS INTO INCHES, 
Multiply by 40. 
Example: 2 meters multiplied by 4o, equals 80 inches. 
For greater accuracy, deduct 1.5 per cent; the 
result will be 78.80 inches, The true equiva- 
lent is 78.74 inches. 
TO CONVERT INCHES INTO CENTIMETERS. 
Multiply by 2.5. 
Example: 6 inches multiplied by 2.5, equals 15 centi- 
meters, : 
