It is in this interconnection of “cross-series” that Herbart identifies the appearance of a lateral or “neighboring” ordering (eines Neben einander geordneten). The crucial element in this order (which applies not only to space but also to time and number (cf. Natorp 1910, and esp. SW VI: 110, ff. (§116)) is the “gradation in the representations’ connection [Abstufung in der Verbindung der Vorstellungen]” laid out in psycho-mechanics (above) (SW VI: 90). Only now, as we apply that abstract doctrine to experience, we see that the small number of representations used for illustrative purposes \((a, b, c, d, \ldots)\), together with their dimmed remainders \((r, R, \rho, \mathfrak{r} \ldots)\), are far too few to account for the innumerable representations generated by the minima visibilia and tangibilia of actual experience (SW VI: 90). Herbart writes: 