The reason whereof is, that the simple ideas whereof our complex ideas of substances are made up are, for the most part, such as carry with them, in their own nature, no VISIBLE NECESSARY connexion or inconsistency with any other simple ideas, whose co-existence with them we would inform ourselves about.

[Illustration: A VERY NECESSARY PRECAUTION.] * *

A NECESSARY QUALIFICATION FOR A HOUSEKEEPER is, that she should thoroughly understand accounts.