When alterations in technical terms become necessary, it is desirable that the new term should contain in its form some memorial of the old one.

Philological analogies are to be preserved if possible, but modified according to scientific convenience.

In forming a Terminology, words may be invented when necessary, but they cannot be conveniently borrowed from casual or arbitrary circumstances.

The fundamental terms of a system of Nomenclature may "be conveniently borrowed from casual or arbitrary circumstances.

If terms are systematically good, they are not to be rejected because they are etymologically inaccurate.

Terms which imply theoretical views are admissible, as far as the theory is proved.

New terms and changes of terms, which are not needed in order to express truth, are to be avoided.

Terms must be constructed and appropriated so as to be fitted to enunciate simply and clearly true general propositions.

It is better to form new words as technical terms, than to employ old ones in which the last three Aphorisms cannot be complied with.

When common words are appropriated as technical terms, this must be done so that they are not ambiguous in their application.