[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.
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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. What we want is facts, not ideas; intelligibility, not profundity—these were the demands with which philosophy was confronted. It was impossible to outflank, in this direction, the representatives of a scientific discipline that admitted of skilful popularisation. There was nothing similar to oppose to it. Philosophers were accordingly compelled to confine themselves to criticism, to show forth the unmistakable defectiveness of the pure-mechanical philosophy, the weaknesses and flaws in its demonstrations and the arbitrary character of its construction; and to point out by a display of much acute reasoning what fifty years before was self-evident, that mind and mental life are not merely an accidental phase of things, not a product incidentally resulting, but an indestructible feature of the inward nature of the world itself.
Much of this extensive antimaterialistic literature, in which may also be included by far the greater part of anti-Darwinian literature, can put forth no claim to lasting worth, and is to-day wholly antiquated. For the simple reason that people no longer understand, or at least will soon no longer be able to understand, the circumstances and conditions out of which this polemical activity sprung: namely the transcendent metaphysical philosophy; mistaken idealism which imagined that existence and reality had to be transfigured in and by cognition instead of through will and action; the secret fear of an endangerment or indeed of a dislodgment of the religio-theological world-conception, the supernatural God-idea, the pure spiritual and immortal soul, the freedom of the will, and other phantoms whatsoever the designations they may bear.
But this warfare against materialism, which was waged by minds of widely varying rank and power, resulted at least in the substantial advantage of having brought the hostile parties closer together, of having forced them to the reciprocal study of their respective means of investigation, and of having put an end to the complete estrangement that formerly existed between them. Not only did it enrich philosophy, but it also led physical science to a correction of many of its conceptions and to a re-examination of its methodological hypotheses.
This is best to be studied, perhaps, by taking to hand the writings of a man who may be characterised pre-eminently as a spokesman of the materialistic movement in Germany,—I mean JAKOB MOLESCHOTT. His well known work Der Kreislauf des Lebens has become in its last, the eighth edition, something quite different from what it was in its first; and the rich collection of his lesser writings (Kleinere Schriften, 2 Vols., 1879-87) also offers the philosopher, especially from a methodological point of view, much that is worthy of especial attention. Moreover, this reciprocal influence of mind upon mind is manifested in the case of many of the most distinguished investigators of the last thirty years, in the most remarkable and gratifying manner. It is impossible to study the discourses and treatises of physiologists like DU BOIS-REYMOND and WILHELM PREYER, of physicists like HELMHOLTZ and ERNST MACH, and the discussions occasioned by their works, without being surprised at the extent to which the points of view of psychology and of the theory of cognition have penetrated into the problems and inquiries of the physical sciences. And vice versa philosophical works, like FR. A. LANGE'S History of Materialism (Geschichte des Materialismus und Kritik seiner Bedeutung in der Gegenwart), UEBERWEG'S Collected Essays (Gesammelte Abhandlungen, just recently edited in a commendable manner by Moritz Brasch), the numerous works of LUDWIG NOIRÉ, and, last but not least, the entire scientific activity of WILHELM WUNDT,—all show an intimate familiarity with the methods of the physical sciences and an assimilation of materials from these branches of knowledge such as the speculative period can furnish no example of.
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Nevertheless, this intellectual revolution, far-reaching as it was, has led neither to solid systematic construction nor even to the successful development of positive methods of thought. Since the decline of speculative philosophy,—in which in this connection the Herbartian may also be included,—two systems only have dominantly influenced the German mind: the system of ARTHUR SCHOPENHAUER and that of HERMANN LOTZE. In both a resonance still lingers of the older time. In Schopenhauer we detect the spirit of Schelling's nature- and art-philosophy; in Lotze, traces of the finely studied subtlety of Herbartian metaphysics. But though both are indebted for a portion of their real intrinsic worth to this organic though involuntary connection with a great epoch, their influence upon the present time rests upon very different grounds; and primarily upon the symmetrical, finished, and compact totality of their intellectual creations. They arose at a time in which philosophers had begun to lay aside the older systems as useless, and in which that multitudinous dismemberment of knowledge already began to make itself felt which to-day seems to be still growing greater. Although it may be difficult in many phases of the development of science to satisfy the impulse latent in us to unify knowledge, and although this endeavor is characterised ever anew by the representatives of special research as a delusion, nay as a ruinous delusion,—yet this impulse is not to be eradicated from the human mind and in some way or other it will ever procure itself recognition. Works like Die Welt als Wille und Vorstellung (World as Will and Idea), or Der Mikrokosmus (Microcosm) embrace in fact the entire sphere of knowledge, not in an extensive, but in an intensive sense: they furnish a definite view of the complete inter-relation and meaning of life.
It will perhaps appear strange to the reader that works are here mentioned in the same breath and their effects upon the present time discussed, which are separated in origin from each other by a space of about forty years. Yet this very anomaly is characteristic of the development of the German mind. When Schopenhauer published, in 1819, his principal work, the time for it had not yet come. The philosophy of Hegel, a rationalistic panlogism, was then in the very midst of its career of triumph. The irrationalistic and pessimistic elements of Schopenhauerian thought were repulsive. We now know that the two first editions of the Welt als Wille und Vorstellung mouldered in the shops of the booksellers. Not until shortly before Schopenhauer's death in 1860 did the literary public and the scholastic circles of Germany begin to occupy themselves more seriously with this philosopher. Not until then did he really enter as an active factor into our intellectual life.