Dieter Henrich has the distinction of having written two classic essays on Kant’s Transcendental Deduction. The first was published in 1969 and is entitled, “The Proof-Structure of Kant’s Transcendental Deduction.”1 The second was published in a 1989 collection and is entitled “Kant’s Notion of a Deduction and the Methodological Background of the first Critique.”2 I suspect that the reason these essays have their canonical status is that the main points they set out to establish have more or less become accepted as fact. In the former, Henrich claims that the two halves of the B-Deduction (§§15-20, §§21-26) constitute one argument where these halves serve as its main steps; they are not distinct arguments for the same conclusion. In the second essay, Henrich argues that the word “deduction” in “Transcendental Deduction” has a sense borrowed from the name of a kind of legal document widely used during the Holy Roman Empire and that this is relevant for understanding Kant’s argument.
But if the main lines of these papers have largely been accepted, the details have not. And here I want to focus on one way in which Henrich’s “Proof-Structure” paper has been challenged. Whatever problems Henrich’s proposal faces, it seems to me that this objection rests on a misunderstanding—due in part, however, to the way Henrich states his case.
Henrich presents his sketch of the B-Deduction’s argument in fewer than three pages (645-47). Consequently, one can imagine that a lot of important detail is missing. He argues that the result in §20 of the B-Deduction “contains a restriction: [Kant] established that intuitions are subject to the categories insofar as they, as intuitions, already possess unity (B143).” This conclusion leaves open, however, “the range within which unitary intuitions can be found” (emphasis Henrich’s). Henrich maintains that the “restriction” of §20 will be “overcome” by §26, employing the following strategy:
[W]herever we find unity, this unity is itself made possible by the categories and determined in relation to them. In our representations of space and time, however, we have intuitions which contain unity and which at the same time include everything that can be present to our senses. For indeed the representations of space and time have their origin in the forms of our sensibility, outside of which no representations can be given to us. We can therefore be sure that every given manifold without exception is subject to the categories.
Now, I wonder whether Henrich does himself a disservice by saying that §20 contains a restriction and that this restriction is overcome by §26. This most naturally suggests that Henrich thinks (that Kant thinks) that there are intuitions that (1) are “unitary” and those that (2) are not and that by §26, Kant concludes that not only the unitary intuitions, but also the non-unitary ones, are “subject to the categories” (by dint of having spatio-temporal form).
Unfortunately, I see little in Henrich’s essay to correct this impression, except some remarks made a few passages after the above citation. Picking up on A90-1/B123, Henrich seems to claim that the possibility that appearances and the understanding might be out of synch—that there might be a “disproportion between consciousness and givenness”—is not real. These remarks suggest that the above summary of Henrich’s analysis of the proof structure of the B-Deduction is wrong. It is not that Kant wants to show that those intuitions that lack unity are also subject to the categories; it is rather that such intuitions do not exist—at least, not for, or in, us. Thus, since only unitary intuitions exist, and since these are subject to the categories, the categories are valid “without restriction.”
This strikes me as ultimately the most natural way to read Henrich’s proposal. The results in §20 are conditional; it is misleading to say that they are restricted, unless one qualifies what one means by this.
With this in mind, I turn to a complaint that has been leveled against Henrich’s analysis by Hoke Robinson3 and Henry Allison.4 Here is Robinson:
To hold that the first step [of the B-Deduction] introduces a restriction which is removed by the second step is to hold that the a priori applicability of the categories is in principle narrower after the first step and broader after the second. In the text, however, it is just the reverse.
For in §20 Kant concludes that his results apply to intuitions in general, whereas in §26 Kant claims that the categories apply to intuitions of which we are capable, given our forms of intuition.
I have difficulty understanding this objection unless I take it to presuppose what I have suggested is a wrong understanding of Henrich. On this reading, Kant claims that unitary intuitions are subject to the categories in §20; by §26, he concludes that all intuitions, including the non-unitary ones, are. Thus the demonstrated applicability of the categories in §20 would be narrower than it is by §26. Hence the objection.
But it is hard to know what to make of this objection on what I have suggested is the correct understanding of Henrich’s proposal. For if the result in §20 is taken to be conditional, rather than restricted, then the applicability of the categories in §20 is neither narrower nor broader than it is in §26. The range of their applicability remains constant: to unitary intuitions. But Kant must show that there are no non-unitary intuitions to worry about in the second half of the B-Deduction.
This is not to say that Robinson and Allison have not raised important issues surrounding Henrich’s proposal (and indeed, I think that each has). It is to say only that I do not believe that this is one of them.
1 Review of Metaphysics 22 (1969): 640-59.
2 In Kant’s Transcendental Deductions: the Three “Critiques” and the “Opus postumum,” edited by Eckart Förster (Stanford: Stanford University Press, 1989), 29-46.
4 Kant’s Transcendental Idealism, 2nd edition, 161; see also 1st edition, 351-52 n6.