In an argument, the premises form a representation of the conclusion, because they indicate the interpretant of the argument, or representation representing it to represent its object. The premises may afford a likeness, index, or symbol of the conclusion. In deductive argument, the conclusion is represented by the premises as by a general sign under which it is contained. In hypotheses, something like the conclusion is proved, that is, the premises form a likeness of the conclusion. Take, for example, the following argument: -
M is, for instance, PI, PII, PIII, and PIV;
S is PI, PII, PIII, and PIV:
.·. S is M.
Here the first premise amounts to this, that “PI, PII, PIII, and PIV” is a likeness of M, and thus the premises are or represent a likeness of the conclusion.