The fourth dimension

THE USE OF FOUR DIMENSIONS IN THOUGHT 103

letters 1, E, 0, in the third wall to the right, the second wall away, the topmost layer. Now this combination of premisses in the mood 1, with a conclusion in the mood 0, is not noticed in any book on logic with which I am familiar. Let us look at it for ourselves, as it seems that there must be something curious in connection with this break of continuity in the poiograph.

Ist figure, fom \ ™“. Sees 8rd figure, 4th figure.

Fig. 58.

The propositions 1, E, in the various figures are the following, as shown in the accompanying scheme, fig. 58 :First figure: some M is P; no S is M. Second figure: some P isM; noS isM. Third figure: some M is P; no Miss. Fourth figure: some PisM; no MisS.

Examining these figures, we see, taking the first, that if some M is P and no §S is M, we have no conclusion of