sphere of formal or deductive Logic. It is the problem of inductive
logic to establish, if possible, a criterion of evidence whereby the
truth or falsehood of propositions may be judged ( 2).

205. Another usual division of propositions is into Pure and Modal,
the latter being those in which the copula is modified by some degree
of probability. This division is excluded by the view which has just
been taken of the copula, as being always simply affirmative or simply
negative.

206. We are left then with the following divisions of
propositions--

Proposition
according to Form
Simple

Complex
Conjunctive
Disjunctive

Universal
Singular
General

according to Matter
Verbal
Real

according to Quantity