As the principal object of these articles is to enable the young reader
to learn something in his sports, and to understand what he is doing,
we shall, before proceeding to the curious tricks and feats connected
with the science of numbers, present him with some arithmetical
aphorisms, upon which most of the following examples are founded:
Aphorisms of Number.
1. If two even numbers be added together, or subtracted from each
other, their sum or difference will be an even number.
2. If two uneven numbers be added or subtracted, their sum or
difference will be an even number.
3. The sum or difference of an even and an uneven number added or
subtracted will be an uneven number.
4. The product of two even numbers will be an even number, and the
product of two uneven numbers will be an uneven number.