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Rh in its present state is unable to dispel; and speculations with regard to the nature of the earliest form of life are as yet premature and futile.

The following references are either general treatises on the Protozoa, or memoirs dealing with special points in a general manner.

.—O. Bütschli, “Protozoa,” in Bronn’s Klassen und Ordnungen des Thierreichs, Bd. I. (1881-1886); idem., “Investigations on Microscopic Forms and Protoplasm,” translated by E. A. Minchin (London, A. & C. Black, 1894); G. N. Calkins, “Studies on the Life History of the Protozoa, IV.” (and other memoirs cited therein), ''Journ. Exp. Zool.'', i. 423-461, 3 plates, 3 text-figs.; idem., “The Protozoa,” Columbia University Biological Series, vi. pp. xvi.+347, 153 text-figs.; Y. Delage and E. Hérouard, Traité de Zoologie Concrète, I. La Cellule et les protozoaires (Paris, 1896); F. Doflein, Die Protozoen als parasiten und Krankheitserreger (Jena, Gustav Fischer, 1901); idem., “Das System der Protozoen,” Arch. f. Protistenkunde, i. 169-192, 3 text-figs.; R. Goldschmidt, “Die Chromidien der Protozoen,” ''Arch. f. Protistenkunde'', (1904), v. 126-144, 1 fig.; R. Goldschmidt and M. Popoff, “Die Karyokinen der Protozoen und der Chromidialapparat der Protozoen—und Metazoenzelle, ” ''Arch. f. Protistenkunde'' (1907), viii., pp. 321-343, 6 text-figs.; M. Hartog, “Protozoa” Cambridge Natural History, vol. i. (London, 1906); R. Hertwig, “Ueber Wesen und Bedeutung der Befruchtung,” ''SB. Akad. München'' (1902), xxxii., pp. 57-73; idem., “Die Protozoen und die Zelltheorie,” ''Arch. f.'' Protistenkunde, (1902), pp. 1-40; W. H. Jackson, “Protozoa” in Rolleston’s Forms of Animal Life, (rev. ed., pp. 818-922, Oxford, 1888); A. Lang, Lehrbuch der vergleichenden Anatomie der wirbellosen Tiere, Bd. 1. Abt. II. Lief. 2, “Protozoa” (Jena, 1901); E. R. Lankester, article “Protozoa” in ''Ency. Brit.'' 9th ed.; idem. (edited by). A Treatise on Zoology by various authors: “Protozoa” in part I., fasc. 2 (1903), and fasc. 1, to be published shortly (London, A. and C. Black); E. A. Minchin, “Protozoa” in Allbutt and Rolleston’s A System of Medicine, rev. ed. vol. ii. pt. 2 (London, 1907); F. Schaudinn, “Neuere Forschungen über die Befruchtung der Protozoen,” ''Verh. deutsch. zool. Ges.'' (1905), xv. 16-35, 1 diagram; H. M. Woodcock, “Protozoa” in ''Zool. Record'' (1902-1905), vols. xxxix.-xlii.
 * (E. A. M.)

 PROUDHON, PIERRE JOSEPH (1809-1865), French socialist and political writer, was born on the 15th of January 1809 at Besançon, France, the native place also of the socialist Fourier. His origin was of the humblest, his father being a brewer's cooper; and the boy herded cows and followed other simple pursuits of a like nature. But he was not entirely self-educated; at sixteen he entered the college of his native place, though his family was so poor that he could not procure the necessary books, and had to borrow them from his mates in order to copy the lessons. At nineteen he became a working compositor; afterwards he rose to be a corrector for the press, reading proofs of ecclesiastical works, and thereby acquiring a very competent knowledge of theology. In this way also he came to learn Hebrew, and to compare it with Greek, Latin and French; and it was the first proof of his intellectual audacity that on the strength of this he wrote an Essai de grammaire générale. As Proudhon knew nothing whatever of the true principles of philology, his treatise was of no value. In 1838 he obtained the pension Suard, a bursary of 1500 francs a year for three years, for the encouragement of young men of promise, which was in the gift of the academy of Besançon.

In 1839 he wrote a treatise L'Utilité de la célébration du dimanche which contained the germs of his revolutionary ideas. About this time he went to Paris, where he lived a poor, ascetic and studious life—making acquaintance, however, with the socialistic ideas which were then fomenting in the capital. In 1840 he published his first work Qu'est-ce que la propriété? His famous answer to this question, “La propriété, c'est le vol” (property is theft), naturally did not please the academy of Besançon, and there was some talk of withdrawing his pension; but he held it for the regular period. For his third memoir on property, which took the shape of a letter to the Fourierist, M. Considérant, he was tried at Besançon but was acquitted. In 1846 he published his greatest work, the Système des contradictions économiques ou philosophie de la misère. For some time Proudhon carried on a small printing establishment at Besançon, but without success; afterwards he became connected as a kind of manager with a commercial firm at Lyons. In 1847 he left this employment, and finally settled in Paris, where he was now

becoming celebrated as a leader of innovation. He regretted the sudden outbreak of the revolution of February (1848), because it found the social reformers unprepared. But he threw himself with ardour into the conflict of opinion, and soon gained a national notoriety. He was the moving spirit of the Représentant du peuple and other journals, in which the most advanced theories were advocated in the strongest language; and as member of assembly for the Seine department he brought forward his celebrated proposal of exacting an impost of one-third on interest and rent, which of course was rejected. His attempt to found a bank which should operate by granting gratuitous credit was also a complete failure; of the five million francs which he required only seventeen thousand were offered. The violence of his utterances led to an imprisonment at Paris for three years, during which he married a young working woman. As Proudhon aimed at economic rather than political innovation, he had no special quarrel with the second empire, and he lived in comparative quiet under it till the publication of his work, De la Justice dans la révolution et dans l'église, (1858) in which he attacked the Church and other existing institutions with unusual fury. This time he fled to Brussels to escape imprisonment. On his return to France his health broke down, though he continued to write. He died at Passy on the 16th of January 1865.

Personally Proudhon was one of the most remarkable figures of modern France. His life was marked by the severest simplicity and even Puritanism; he was affectionate in his domestic relations, a most loyal friend, and strictly upright in conduct. He was strongly opposed to the prevailing French socialism of his time because of its utopianism and immorality; and, though he uttered all manner of wild paradox and vehement invective against the dominant ideas and institutions, he was remarkably free from feelings of personal hate. In all that he said and did he was the son of the people, who had not been broken to the usual social and academic discipline; hence his roughness, his one-sidedness, and his exaggerations; but he is always vigorous, and often brilliant and original.

It would of course be impossible to reduce the ideas of such an irregular thinker to systematic form. In later years Proudhon himself confessed that “the great part of his publications formed only a work of dissection and ventilation, so to speak, by means of which he slowly makes his way towards a superior conception of political and economic laws.” Yet the groundwork of his teaching is clear and firm; no one could insist with greater emphasis on the demonstrative character of economic principles as understood by himself. He strongly believed in the absolute truth of a few moral ideas, with which it was the aim of his teaching to mould and suffuse political economy. Of these fundamental ideas, justice, liberty and equality were the chief. What he desiderated, for instance, in an ideal society was the most perfect equality of remuneration. It was his principle that service pays service, that a day's labour balances a day's labour—in other words, that the duration of labour is the just measure of value. He did not shrink from any of the consequences of this theory, for he would give the same remuneration to the worst mason as to a Phidias; but he looks forward also to a period in human development when the present inequality in the talent and capacity of men would be reduced to an inappreciable minimum. From the great principle of service as the equivalent of service is derived his axiom that property is the right of aubaine. The aubain was a stranger not naturalized; and the right of aubaine was the right in virtue of which the sovereign, from the earliest monarchy, claimed the goods of such a stranger who had died in his territory. Property is a right of the same nature, with a like power of appropriation in the form of rent, interest, &c. It reaps without labour, consumes without producing, and enjoys without exertion. Proudhon's aim, therefore, was to realize a science of society resting on principles of justice, liberty and equality thus understood; “a science absolute, rigorous, based on the nature of man and of his faculties,