Note A — APPENDIX I

Supplementary note. What is here said of the general applicability of the existential form holds good only with the one manifest limitation, in respect of judgments which are really completely simple. In expressing such judgment logic has always made use of the categorical form; in common life they are often applied as the expression of a plurality of judgments based upon each other. This is clearly the case in the proposition, “this is a man.” In the demonstrative “this” the belief in existence is already included; a second judgment then ascribes to him the predicate “man.” Similar cases are frequent elsewhere. In my opinion it was the original purpose of the categorical form to serve as a means of expressing such double judgments (Doppelurteile), which recognize something while affirming or denying something else of it. I also believe that the existential and impersonal forms have, by a change in function, proceeded from this form. This does not alter its essential nature: a lung is not a swim-bladder (Fisch-blase) even though it has developed therefrom, and the word “kraft” is none the less a merely syncategorematic word (Cf. Mill, Logic, i. 2, § 2), even though its origin may be traced to a substantive.