Aristotle's Theory of Actuality.

Bechler, Zev. Albany, New York: State University of New York Press, 1995. x + 270 pp. $23.95--This monograph aims to give an account and critique of the concept of "actuality" in Aristotle's writings (the word "actuality" is used for the two Greek words [GREEK TEXT NOT REPRODUCIBLE IN ASCIII] and [GREEK TEXT NOT REPRODUCIBLE IN ASCIII]. The author aims to challenge traditional readings of Aristotelian actuality. In particular, he wishes to show that Aristotle is wedded to something he calls anti-informationism." This is the view that understanding the way things are (their "actuality") does not really give us any information about what things do or how they will act. It does not give us any "new physical information." Aristotelian explanation is really redescription substituting for genuine explanation.

Bechler sets out his far-reaching case against Aristotelian actuality in four densely argued chapters. In the first chapter he argues that Aristotle distinguishes between what Bechler calls "consistency potentiality" and "genuine potentiality." The former refers to potentiality for one or more contraries that are not (or never) actualized. The latter refers to the only potentiality Aristotle wishes to defend, namely, potentiality that necessarily entails actualization, indeed, potentiality that is only inferable from an actualization. Thus, Aristotle is made to ally himself with the Megarians malgre lui. Along the way we have a rather disjointed discussion of Aristotle's treatment of natural motion in the Physics the import of which is that Aristotle has no coherent account of natural motion, thereby undermining his theology.

In the second chapter, the author seeks to "confirm, illustrate, and develop" the thesis of chapter 1. Thus, he argues that "consistency potentiality" is akin to "coincidence and to the relative," which are interpreted to be "without reality." Further, he argues that in Aristotle there is no valid argument for the separate existence of form. Indeed, he argues that "the idea of pure actuality is self-contradictory within Aristotle's ontology" (p. 83). Finally, he attacks the question of the unity of substance in the Metaphysics arguing that "matter and form, potentiality and actuality, are for Aristotle not components of substance but merely two different descriptions that denote one and the same object".

In chapter 3, focused broadly on Aristotle's philosophy of science, Bechler argues for a conception of necessity appropriate to the aforementioned "genuine potentiality." In addition, there is a lengthy argument seeking to interpret Aristotle's theory of scientific demonstration extensionally, that is, as pertaining to what is called "group containment" (groups are here equated with sets) (p. 85).

The fourth and final chapter argues for the surprising claim that "Aristotle cannot possess a viable philosophy of mathematics through his central concept of 'separation in thought'" (p. 160). According to the author, the problem here is that Aristotle identifies "thought" with "imagemaking" and therefore it is impossible for him to eliminate a temporal dimension from his mathematics.

This book contains a bold challenge to some fundamental Aristotelian doctrines. It is not a work whose imaginative hypotheses are much constricted by fidelity to the texts. Typically, we read a statement like [t]aking potentiality as steresis" (p. 20) which then goes on to draw the disastrous conclusions of this for Aristotle. But Aristotle says at Physics 192a3--that "matter and privation are different" where "potentiality" is interchangeable with "matter." So, "taking potentiality as steresis" is Bechler's idea, not Aristotle's. Instead of asking whether there is a legitimate interpretation of a passage that would make it cohere with things said elsewhere, the author unerringly opts for interpretations that make Aristotle look like a fool. One wonders what is the point of such an exercise.