I shall select on this occasion from the superabundant store of Kantian literature the works of two writers only to whom the characterisation just advanced does not apply, and to whom independent and fundamental importance belongs. They are, first, ERNST LAAS,[58] professor at the University of Strassburg, who died in 1885, and second, ALOIS RIEHL,[59] formerly of Gratz, now of Freiburg. Both began with Kantian research. Neither remained identified with it. Both sought to supply a new foundation for that branch of philosophy that deals with the theory of cognition; both brought to the service of their task, in addition to eminent critical and analytical acumen, comprehensive historical knowledge. Widely different in method, both pursued the same end—the eradication of that transcendent bias which had so pernicious an influence with Kant himself and his immediate followers, and the replacing of all dualistic opposition of a higher and a lower, or a real and a phantom world, by a philosophy of reality based upon the rigid analysis of pure experience. Both, therefore, are, in this sense, indispensable preconditions of every monistic philosophy that is not founded on immediate intellectual perception, or mere postulates, but aims at a critical foundation. [58] Laas, _Idealismus und Positivismus_, 3 Vols. 1876-87. [59] Riehl, _Der philosophische Kriticismus und seine Bedeutung für die positive Wissenschaft_, 3 Vols. 1876-87. * * * * * Simultaneously with this battle for the "real" Kant and the measure of that in his philosophy which could be utilised as the groundwork of a new structure conforming to the conditions of the times, German philosophy in the second half of this century waged another war. No fratricidal struggle this, no mere scholastic feud, but a battle for existence with a foreign foe—the physical sciences. After the speculative philosophy had retired from the throne that it had so long occupied, and the vacancy seemed yet unfilled, the attempt was made to place in the unoccupied seat another intellectual power whose credit and authority with the contemporary world had begun to keep pace with the success that attended its endeavors. We shall designate these attempts briefly as "materialism," and understand by the term any and every endeavor that aims at constructing a conception of the world with the means and methods of the mathematical and mechanical sciences alone. That which was here sought after was the exact opposite of the state of things that obtained in the speculative period; and the treatment that the speculative philosophy had to submit to at the hands of many of the spokesmen of the new movement was not entirely undeserved. The battle that German philosophy here had to fight was no easy one. Its foe occupied every position of vantage. The real or apparent exactness of its principles, the detailed character of the structure of the world that it bade fair to offer were a power.