Of these noumenal idealisms the earliest in time and the nearest to Fichte's philosophy was the panlogism, begun by Schelling (1775-18J4), completed by his disciple Hegel (1770-1831), and then modified by the master himself.
Von Hartmann, who (Die Philosophie des Unbewussten, 1869, 1st ed.), advanced the view that the world as noumenal is both unconscious intelligence and unconscious will, thus founding a panpneumatism which forms a sort of reconciliation of the panlogism of Hegel and the panthelism of Schopenhauer.
The resemblance of this noumenal idealism to that of Fechner is unmistakable.
Thus it turns out that the objective agency, the noumenal power, the absolute force, declared unknown and unknowable, is known after all to exist, persist, resist and cause our subjective affections or phenomena, yet not to think or to will.
It is upon this in the last resort that the distinction between the phenomenal world of our experience and a noumenal world beyond it is founded.
His psychological starting-point was the unproved assumption that the only force of which we are immediately aware is will; his metaphysical goal was the consistent conclusion that in that case the only force we can know, as the noumenal essence of which all else is phenomenal appearance, is will.
In Great Britain Mach's scepticism was welcomed by Karl Pearson to support an idealistic phenomenalism derived from Hume, and by Ward to support a noumenal idealism derived from Lotze.
Their real founder was Fichte, on account of his definite reduction of the noumenal to a mental world.
Coleridge (1772-1834) not only called attention to Kant's distinction between understanding and reason, but also introduced his countrymen to the noumenal idealism of Schelling.
In the second place, having declared the noumenal power, which causes phenomena, or conscious affections, to be unknowable, and having left anybody who pleased to make it a god and an object of religion, he proceeds to describe it as if it were known force, and known in two respects as persistent and as resistant force.