ABSTRACT
Inference by converse relation is very common in ordinary life. It frequently happens that we want to know the relation of Q to S, but, if S is the more important of the two, the works of reference we consult will give us information about the relation of S to Q. Given the proposition S is P it is possible and sometimes convenient to add a third term to both S and P, say D, and so obtain the inference DS is DP the terms of which are more complex than those of the original proposition. The validity of immediate inference by complication of terms depends on two conditions: The determinant or determinatum must be relevant to the terms of the original proposition; it must have precisely the same meaning in conjunction With both terms.
