Composition.
Mealed powder, 12 oz.; saltpetre, 3 oz.; sulphur, 1½ oz.
Two ounces of iron sand, or camphor, may be added, but it keeps better without either.
PART XII.
MATHEMATICS.
Mathematics is the science which treats of all kinds of quantity whatever, that can be numbered, or measured.
Arithmetic is that part which treats of numbering.
Fractions treat of broken numbers, or parts of numbers.
Algebra is the art of computing by symbols.
In this science, quantities of all kinds are represented by the letters of the alphabet.