FIBRIN, or Fibrine, a protein formed by the action of the so-called fibrin-ferment on fibrinogen, a constituent of the blood-plasma of all vertebrates. This change takes place when blood leaves the arteries, and the fibrin thus formed occasions the clotting which ensues (see [Blood]). To obtain pure coagulated fibrin it is best to heat blood-plasma (preferably that of the horse) to 56° C. The usual method of beating a blood-clot with twigs and removing the filamentous fibrin which attaches itself to them yields a very impure product containing haemoglobin and much globulin; moreover, it is very difficult to purify. Fibrin is a very voluminous, tough, strongly elastic, jelly-like substance; when denaturalized by heat, alcohol or salts, it behaves as any other coagulated albumin.
FICHTE, IMMANUEL HERMANN (originally Hartmann) VON (1797-1879), German philosopher, son of J.G. Fichte, was born at Jena on the 18th of July 1797. Having held educational posts at Saarbrücken and Düsseldorf, in 1836 he became extraordinary professor of philosophy at Bonn, and in 1840 full professor. In 1842 he received a call to Tübingen, retired in 1867, and died at Stuttgart on the 8th of August 1879. The most important of his comprehensive writings are: System der Ethik (1850-1853), Anthropologie (1856, 3rd ed. 1876), Psychologie (1864-1873), Die theistische Weltansicht (1873). In 1837 he had founded the Zeitschrift für Philosophie as an organ of his views, more especially on the subject of the philosophy of religion, where he was in alliance with C.H. Weisse; but, whereas Weisse thought that the Hegelian structure was sound in the main, and that its imperfections might be mended, Fichte held it to be incurably defective, and spoke of it as a “masterpiece of erroneous consistency or consistent error.” Fichte’s general views on philosophy seem to have changed considerably as he advanced in years, and his influence has been impaired by certain inconsistencies and an appearance of eclecticism, which is strengthened by his predominantly historical treatment of problems, his desire to include divergent systems within his own, and his conciliatory tone. His philosophy is an attempt to reconcile monism (Hegel) and individualism (Herbart) by means of theism (Leibnitz). He attacks Hegelianism for its pantheism, its lowering of human personality, and imperfect recognition of the demands of the moral consciousness. God, he says, is to be regarded not as an absolute but as an Infinite Person, whose nature it is that he should realize himself in finite persons. These persons are objects of God’s love, and he arranges the world for their good. The direct connecting link between God and man is the “genius,” a higher spiritual individuality existing in man by the side of his lower, earthly individuality. Fichte, in short, advocates an ethical theism, and his arguments might easily be turned to account by the apologist of Christianity. In his conception of finite personality he recurs to something like the monadism of Leibnitz. His insistence on moral experience is connected with his insistence on personality. One of the tests by which Fichte discriminates the value of previous systems is the adequateness with which they interpret moral experience. The same reason that made him depreciate Hegel made him praise Krause (panentheism) and Schleiermacher, and speak respectfully of English philosophy. It is characteristic of Fichte’s almost excessive receptiveness that in his latest published work, Der neuere Spiritualismus (1878), he supports his position by arguments of a somewhat occult or theosophical cast, not unlike those adopted by F.W.H. Myers. He also edited the complete works and literary correspondence of his father, including his life.
See R. Eucken, “Zur Erinnerung I. H. F.,” in Zeitschrift für Philosophie, ex. (1897); C.C. Scherer, Die Gotteslehre von I. H. F. (1902); article by Karl Hartmann in Allegemeine deutsche Biographie xlviii. (1904). Some of his works were translated by J.D. Morell under the title of Contributions to Mental Philosophy (1860).
FICHTE, JOHANN GOTTLIEB (1762-1814), German philosopher, was born at Rammenau in Upper Lusatia on the 19th of May 1762. His father, a ribbon-weaver, was a descendant of a Swedish soldier who (in the service of Gustavus Adolphus) was left wounded at Rammenau and settled there. The family was distinguished for piety, uprightness, and solidity of character. With these qualities Fichte himself combined a certain impetuosity and impatience probably derived from his mother, a woman of a somewhat querulous and jealous disposition.
At a very early age the boy showed remarkable mental vigour and moral independence. A fortunate accident which brought him under the notice of a neighbouring nobleman, Freiherr von Miltitz, was the means of procuring him a more excellent education than his father’s circumstances would have allowed. He was placed under the care of Pastor Krebel at Niederau. After a short stay at Meissen he was entered at the celebrated school at Pforta, near Naumburg. In 1780 he entered the university of Jena as a student of theology. He supported himself mainly by private teaching, and during the years 1784-1787 acted as tutor in various families of Saxony. In 1787, after an unsuccessful application to the consistory for pecuniary assistance, he seems to have been driven to miscellaneous literary work. A tutorship at Zürich was, however, obtained in the spring of 1788, and Fichte spent in Switzerland two of the happiest years of his life. He made several valuable acquaintances, among others Lavater and his brother-in-law Hartmann Rahn, to whose daughter, Johanna Maria, he became engaged.
Settling at Leipzig, still without any fixed means of livelihood, he was again reduced to literary drudgery. In the midst of this work occurred the most important event of his life, his introduction to the philosophy of Kant. At Schulpforta he had read with delight Lessing’s Anti-Goeze, and during his Jena days had studied the relation between philosophy and religion. The outcome of his speculations, Aphorismen über Religion und Deismus (unpublished, date 1790; Werke, i. 1-8), was a species of Spinozistic determinism, regarded, however, as lying altogether outside the boundary of religion. It is remarkable that even for a time fatalism should have been predominant in his reasoning, for in character he was opposed to such a view, and, as he has said, “according to the man, so is the system of philosophy he adopts.”
Fichte’s Letters of this period attest the influence exercised on him by the study of Kant. It effected a revolution in his mode of thinking; so completely did the Kantian doctrine of the inherent moral worth of man harmonize with his own character, that his life becomes one effort to perfect a true philosophy, and to make its principles practical maxims. At first he seems to have thought that the best method for accomplishing his object would be to expound Kantianism in a popular, intelligible form. He rightly felt that the reception of Kant’s doctrines was impeded by their phraseology. An abridgment of the Kritik der Urtheilskraft was begun, but was left unfinished.