Christian Wolff's Prolegomena to Empirical and Rational Psychology: Translation and Commentary*
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CHRISTIAN WOLFF'S PROLEGOMENA TO EMPIRICAL AND RATIONAL PSYCHOLOGY: TRANSLATION AND COMMENTARY* ROBERT J. RICHARDS Assistant Professorin the History of Science and Biopsychology, University of Chicago INTRODUCTION Wolff (1679-1754), who became a leading figure Though not the first to use the term "psychology" in the German Enlightenment and a foil to Kant's 1 (psychologia), Christian Wolff did give it currency development of critical philosophy, was born in in the mid-eighteenth century. He was the first to Breslau. There he attended the Gymnasium of Mary mark off the discipline of empirical psychology and to Magdalen, where his studies focused on Scholastic distinguish it from rational, or theoretical, psychology. philosophy, natural science, and mathematics. He This distinction and his conception of the two cor- continued his education at the universities in Jena responding methods of conducting psychological in- and Leipzig, concentrating especially on mathematics, quiry, especially his emphasis on the use of introspec- philosophy, and theology. 8 In 1704 he began a cor- tion, profoundly influenced the course of psychological respondence with Leibniz on scientific issues, which 4 science during the eighteenth and nineteenth centuries. continued till the latter's death in 1716. Leibniz's These historical circumstances supply sufficient rea- influence brought Wolff a professorship in mathe- son for translating the two brief tracts which epito- matics and science at Halle in 1707 and membership mize Wolff's psychology, the prolegomena to his in the Berlin Academy in 1711. At Halle he lectured Psychologia empirica and Psychologia rationalis.2 on mathematics and expounded a philosophical system -an integration of Leibnizian rationalism, late * I am grateful to Richard Blackwell, Daniel Garber, and Scholasticism, and refined scientific empiricism- August Imholtz for their valuable suggestions for improv- ing the translation, and to David Leary and William Wood- ment to section 34 of his Psychologia rationalis. In the trans- ward for their advice on matters of eighteenth- and nineteenth- lations, Wolff's own explanatory notes are preceded by an century psychology. asterisk. The following abbreviationswill also be employed: 1 Rudolf Goclenius, a scholastic composer of philosophical Log: Philosophia rationalis sive Logica, methodo scientifica lexicons, seems to have been the first to have used the term pertracta et ad usum scientiarum atque vitae aptata. "psychology" (in Greek letters) ; it appeared as part of the Praeimititur Discursus praeliminaris de philosophia in title of a collection of tracts, which he edited in 1590, on genere, Francofurti et Lipsiae: 1728, 1732, 1740. the nature and origin of the human soul. Several other au- Disc. praelim.: Discursus praeliminaris de philosophia in thors prior to Wolff, including Leibniz, also used the term to genere (this part of Wolff's Log. has been translated by refer to a distinct discipline. The discipline itself, of course, Richard Blackwell: Christian Wolff, Preliminary Dis- may be traced back to Aristotle's Peri psyche and a multitude course on Philosophy in General [Indianapolis: Bobbs- of Scholastic treatises, usually carrying the title De anima. Merrill, 1963]); Jean Acole, in his introduction to the photo-reproductionof Ontol.: Philosophia prima, sive Ontologia, methodo scien- Wolff's Psychologia empirica (see next note for bibliographic tifica pertractata,qua omnis cognitionis humanaeprincipia details), lists several of the works in which the term "psy- continentur, Francofurti et Lipsiae, 1730, 1736; chologia" appeared before Wolff. Cosmol.: Cosmologia generalis, methodo scientifica per- 2 The texts used in the translation of Wolff's two prolego- tractata, qua ad solidam, inprimis Dei atque naturae, mena are: Psychologia empirica, methodo scientifica per- cognitionem via sternitur, Francofurti et Lipsiae, 1731, tractata, qua ea, quae de anima humana indubia experientiae 1737; fide constant, continentur (2nd ed.; Francofurti & Lipsiae: Vernunft. Gedank.: Vernunftige Gedankenvon den Kriaften officina libraria Rengeriana, 1738; 1st ed., 1732); and Psy- des menschlichen Verstandes und ihrem richtigen Ge- chologia rationalis, methodo scientifica pertractata, qua ea, brauche in Erkenntnis der Wahrheit, Halle, 1713. quae de anima humana indubia experientiae fide innotescunt, All of the above, except the Log., have appeared in Christian per essentiam et naturam animae explicantur (2nd ed.; Wolff, Gesammelte Werke, ed. H. Arndt and J. tcole Francofurti & Lipsiae: officina libraria Rengeriana, 1740; (Hildesheim: Olms, 1962-). The Latin volumes of the 1st ed., 1734). The second edition of these works does not Gesammelte Werke are photocopies of the final Frankfurt differ essentially from the first. The Psychologia empirica editions. was paraphrasedand abridged by an anonymous French ad- 3 Details of Wolff's early studies and career are given in mirer (A. T.) ; it appeared as Psychologie ou Traite sur the extensive compendiumof his contemporarydisciple Carl lame, par M. Wolf (Amsterdam: Schreuder& Mortier, 1756). GuintherLudovici, Ausfiihrlicher Entwurf einer vollstdndigen In the footnote commentary, I have followed Wolff's con- Historie der Wolffschen Philosophie (3 vols.; Liepzig: vention of referring to passages by the use of section num- Lowe, 1735-1738). bers: thus the citation "Psychol. empir. #142" is to the 4 C. Gerhardt has edited and published the correspondence section of his Psychologia empirica so numbered; "Psychol. in Briefwechsel zwischen Liebniz und Christian Wolff (Hilde- rat. #34 not." indicates Wolff's note of explanation and com- sheim: Olms, 1963). PROCEEDINGS OF THE AMERICAN PHILOSOPHICAL SOCIETY, VOL. 124, NO. 3, JUNE, 1980 227 228 ROBERT J. RICHARDS [PROC. AMER. PHIL. SOC. which finally so antagonized his Pietistic colleagues For Wolff, the essence of scientific understanding is that it secured his exile in 1723. Under ban of the ability to demonstrate propositions-that is, log- Frederick I, Wolff was given forty-eight hours to ically to derive them from definitions, axiomatic leave the country. By this time, however, his several truths, propositions already demonstrated, or pro- German works in philosophy and his tracts in mathe- positions expressing indubitable experience. In regard matics had won him considerable attention, even out- to mental science, empirical psychology is charged side his native land. To reach that wider audience, with two basic functions: to produce indefeasibly he began elaborating his complete system of philo- certain experience, on the basis of which propositions sophic science in a series of Latin volumes done concerning the nature of mind can be demonstrated; largely in the Scholastic style, starting with Philo- and by the same means, to furnish experiential cor- sophia rationalis sive Logica in 1728 and continuing roboration for deductive conclusions. That empirical with works in cosmology, psychology, natural theol- psychology can yield such experience in the perform- ogy, ethics, mathematics, mechanics, optics, astron- ance of these functions is insured by Wolff's assump- omy, and other sciences. His Psychologia empirica tion that apperception is involved in every cognition of appeared in 1732 and in a revised edition in 1738; his objects and events. 9 He is thus confident that through Psychologia rationalis also went through two editions, careful attention to our perceptions, we can have in 1734 and 1740. In 1740 Frederick II recalled veridical experience of the mind's activity. 10 Wolff from Marburg, where he taught during his In complementary fashion, rational psychology pro- exile, and appointed him professor of law at Halle. ceeds a priori and deductively to demonstrate truths In 1743 Wolff became rector of the University and about the mind. The concepts and propositions in 1745 a baron of the Holy Roman Empire. He which it uses are derived from more fundamental dis- remained at Halle until his death at age seventy-five. ciplines-physics, metaphysics, and empirical psychol- The principal subject of Wolff's empirical psychol- ogy. Because of its a priori and deductive character, ogy, as well as his rational psychology, is mind (or rational psychology for Wolff comes closer than soul) and its activities. The two disciplines of psy- empirical psychology to realizing the ideal of science chology, in his construction, are distinguished chiefly as a set of ordered propositions, of which the ante- by their methods. Empirical psychology, while not cedent provide sufficient reasons for the consequent. neglecting observations of external behavior, has as Moreover, in his view, rational psychology is able to its primary method the mind's direct introspection penetrate further than empirical psychology, because of its own activities, either by catching on the wing not all features of mind are immediately accessible its normal operations or by contriving experiments in through direct introspection. There is, however, a order to elicit particular acts. Wolff details two sets price to be paid for speculative extension-rational of assumptions, one regarding the structure of per- psychology is less certain. Long chains of reasoning ceptual experience and the other its certitude, that invite mistakes. Here empirical psychology has the make the introspective method of empirical psychol- advantage, for it keeps the mind in contact with the ogy possible. immediate data of mental facts. According to Wolff, perception is an act of the In