But it is merely an outer appearance, whose substratum is not cognized through any specifiable predicates; hence I can well assume about this substra tum that in itself it is simple, even though in the way it affects our outer senses it produces in us the intuition of something extended and hence composite; and thus I can also assume that in the substance in itself, to which extension pertains in respect of our outer sense, thoughts may also be present, which may be represented with consciousness through their own inner sense.