"In Spinoza," says Mr. Morell, "we see the model upon which the modern Idealists of Germany have renewed their search into the absolute ground of all phenomena;" and there can be no doubt that his speculations contain the germ of Ideal as well as of Material Pantheism. The historical filiation of modern Pantheism cannot be satisfactorily explained, in either of its two forms, without reference to his writings; and yet its precise character, as it is developed in more recent systems, demands for its full elucidation some knowledge of the course and progress of philosophical speculation in the interval which elapsed between the death of Spinoza and the subsequent developments of his theory. We cannot here attempt to trace the history of German Idealism, from its source in the writings of Leibnitz, through the logical school of Wolfius and his successors, till it reached its culminating point in the philosophy of Hegel:--we shall content ourselves with a brief reference to the fundamental principles of Kant's system, which may be justly said to have contained the prolific germs, or, at least, to have determined the prevailing character, of all the subsequent speculations of the German schools. For if modern Pantheism be indebted to Spinoza for its _substance_, it is equally indebted to Kant for its _form_; and no intelligible account can be given of the phases which it has successively assumed, without reference to the powerful influence which his Philosophy, in one or other of its constituent elements, has exerted on all his successors in the same field of inquiry. The Philosophy of Kant has a most important bearing on the whole question as to the validity of the natural evidence for the being and perfections of God. We shall confine our attention to those parts of his system which give rise to the speculations that have issued in the recent theories of Ideal or Spiritual Pantheism.