46. Immediate Inferences. -- We shall presently see that, in a reasoning properly so called, the conclusion springs from the comparison of three different terms, and that this comparison is made in two propositions, the two premises of the reasoning. It is sometimes permissible to draw at once a sort of conclusion from the enunciation of a single proposition: this is called an immediate inference.

The conversion, opposition, and subordination of propositions give occasion to inferences of this kind.

The rules given above sufficiently show how these inferences are justified.