Did Heidegger Read Kant's Transcendental Dialectic?

In the midst of an admirably even-handed consideration of the early Heidegger's auseindersetzung with Kant, David Carr makes a fleeting observation about how the intensive probing of that hermeneutic confrontation also  happens to be exclusive of an extensive reading ---even, in fact, exclusive of the entire extent of the first Kritik upon which it is focused:

One thing that strikes readers of Heidegger on Kant in these writings is that his analysis is very detailed and close to the text, but it is focused entirely on the first Critique and indeed goes no farther than the first third of that work. He has almost nothing to say about the “transcendental dialectic”and its critique of traditional metaphysics, in which the first Critique culminates, much less about Kant’s moral philosophy, for which the first Critique is preparing the way.

Carr doesn't stop with this somewhat blunted criticism, however. In what is an appraisal in all other ways self-restrained, Carr permits himself the following anomalously pointed remark: "...I have to wonder, in all seriousness, if Heidegger ever got as far as the paralogisms in his reading of the first Critique." The implication of Carr's speculation is clear: even in terms of its sources, Heidegger's reading of Kant is a narrow, lopsided one.
  In the present post, I want to take the opportunity to briefly suggest one reason why this is so --- why, that is, it is far from a matter of accident that Heidegger devotes himself exclusively to the Transcendental Aesthetic and Analytic in the majority of his Kant interpretations. As an aside I would allow the remark that Heidegger did not read other parts of Kant's corpus to pass as a piece of rhetorical hyperbole, were it not for the fact that even hyperbole does not allow itself to contradict historical fact (there is no need to waste breathe justifying Heidegger here on this point, he marshals so much evidence in the copious cross references he makes to the entirety of Kant's corpus ---nevermind the Dialectic). It might have been a nice addition to his Kant interpretation if Heidegger had produced, say, a phenomenological, or later, a seynsgeschichtliche interpretation of the Dialectic, one that is not altogether inconceivable in what its outline would have looked like, but Heidegger did not do so for, I would argue, a rather simple structural reason. One need only consider the architectonic of Kant's first Kritik to supply himself with the readily available answer.
   While the arrangement of the Kritik's Doctrine of Elements  can be regarded, as the Prolegomena in fact does regard it, as an arrangement of increasingly comprehensive pure foundations for the sciences of mathematics, physics, metaphysics respectively treated under the Aesthetic, Analytic, and Dialectic, nevertheless the work's arrangement can also be regarded from another vantage point. If in the former regard it is the Dialectic that treats of the possibility of metaphysics as an actual science, then in the latter regard it is the Transcendental Logic as a whole that furnishes the reader with the principles for a science of metaphysics as Kant alone wishes to establish it. This double vantage point is inherent to the work itself and may be explained by the fact that the pure physiological principles of the Analytic are at the same time metaphysical, since for Kant they ground any possible gegenstandsbeziehung.   In the order of presentation, then, the Analytic is designed to take over exactly that place reserved by Scholastic thought for metaphysica generalis, while the Dialectic is to occupy the place of metaphysica specialis. That this is so according to the rule of the work is made all the more obvious by the fact that the Dialectic's threefold division of paralogisms, antinomies, and Transcendental Ideals mirrors precisely the threefold division of metaphysica specialis into the specific domains of soul, world, and God. And it is precisely in this superficial observation of the works arrangement that we have a strong indication of the reason for Heidegger's focus. Months before Heidegger gives his phenomenological interpretations of the first Kritik, Heidegger is introducing to his students, in the Grundprobleme lectures of 1927, the problem of ontological difference, and he is doing so precisely through a destruktive meditation on Kant's categories of modality as they circumscribe the bounds of real predication. Although Heidegger had previously penetrated the Transcendental Analytic before the Phenomenological Interpretations in his 1925 Logik lectures, there it was self-evident why his examination had to limit itself in range and scope. By contrast the Phenomenological Interpretations, like the controversial Kantbuch that followed it, stood in need of some justification, and the Grundprobleme proffer that in linking the interpretation of Kant with the elaboration of the ontological difference.
     This link is of direct importance to the issue of Heidegger's attachment to the Analytic because it is as a consequence of the ontological difference that Heidegger will sever the possibility of doing anything like a metaphysica specialis from ontology properly understood. A properly ontological science will begin, as all metaphysica generalis attempt to do, with the question of Being as such. But, as the Grundprobleme make clear in their introduction, the method by which such a beginning is to be made consists in enacting a phenomenological reduction ---one which is vastly different from the move Husserlian phenomenology acknowledges by that name. In fact, precisely what was allegedly bracketed in Husserl's reduction is what is shifted toward in Heidegger's, namely Being as an antecedent given (seinsverstaendnis) which precedes and enables ontic datum:

We call this basic component of phenomenological method - the leading back or reduction of investigative vision from a naively apprehended being to Being phenomenological reduction. We are thus adopting a central term of Husserl's phenomenology in its literal wording though not in its substantive intent. For Husserl the phenomenological reduction, which he worked out for the first time expressly in the Ideas Toward a Pure Phenomenology and Phenomenological Philosophy (1913), is the method of leading phenomenological vision from the natural attitude of the human being whose life is involved in the world of things and persons back to the transcendental life of consciousness and its noetic-noematic experiences, in which objects are constituted as correlates of consciousness. For us phenomenological reduction means leading phenomenological vision back from the apprehension of a being, whatever may be the character of that apprehension, to the understanding of the Being of this being (projecting upon the way it is unconcealed).   

Heidegger's self-comparison with his mentor here is particularly instructive in the task of clarifying Heidegger's reading of Kant's Kritik; the explanation (and/or justification) of object-constitution in light of transcendental consciousness has its roots in Kant's Analytic as it is usually interpreted. If an interpretation of the Kritik is to be a phenomenological  interpretation, then it will presumably have to enact the step required to initiate any phenomenological research, namely, Heidegger's onto-phenomenological reduction. But that reduction, which serves to properly raise questions traditionally belonging to metaphysica generalis, precludes the establishment of metaphysica specialis, since, insofar as it investigates three specific (domains of) objects, the latter would be a reversal of the reduction, moving from Being to beings --a move that can only be permitted if the ontological difference remains misunderstood as a difference. Heidegger's reduction is accordingly a recapitulation of the ontological difference contra to  yet presupposed by the difference between genus and species, and therefore also problematic for the difference between metaphysica generalis and metaphysica specialis. To be more precise, the reduction shows, through the view that it enacts, a difference already present in the domain of metaphysica generalis, prior to its own demarcation from metaphysica specialis. This ontological difference, as the phenomenon which makes possible any science capable of investigating positive data, renders the three specific objects of metaphysics, namely soul, world, and God, as subject to this further unaddressed ontological difference. Soul, world and God have always been interpreted according to an already established metaphysica generalis in order to be secured as objects of investigation --and even when that security is problematized, it is done so only by what is accomplished beforehand by metaphysica generalis ---just as Kant's Analytic supplies the ground for his paralogisms, antinomies, and Ideals. In short, general metaphysics must settle itself and stabilize its fundamental principles before specific metaphysics can commence.  But if one is to, as Heidegger's phenomenological reduction would have it, demonstrate a difference problematizing the ability of metaphysica generalis to come to rest and thereby lay the foundations of metaphysica specialis, then he will also have to read the Analytic in such a way that makes it incapable of dispatching with further consideration of its subject matter in order to then transition to the Dialectic.  The phenomenologically reduced Analytic will be the
beginning of an inexhaustible perplexity.

Epistemology and Logic (Part Three): On the Derivation of Propadeutic Logic

    

Logic is at once self-reflexive art and it is propadeutic to science. It is self-reflexive art because the direction which this art gives is meta-direction --that is, logic is the art of the direction of that which directs all arts (including logic). If meta-direction accounts for the manner in which logic relates to all possible art, then its relation to all possible science is accounted for by its being a propadeutic. It is a propadeutic because it is reason's knowledge of itself, but only at the level of an art and not yet a science, since, for Aristotle, the causes of reason lie outside of reasoning, in the matter (τὸ ὄν)  being reasoned about.
        This double orientation of logic gives it, as an art, a twofold uniqueness. Because logic is meta-directively oriented toward art, the formulation of its rules happens in the same medium as does the appropriation of that unarticulated domain (from out of which  those rules are derived), namely rational speech, λόγος. No other art can be acquired from out of the same domain as its rules can be expressed. On other hand, because of its orientation to science, namely, as a propadeutic, logic is the only art that is supposed to expressly offer its rules as a part of its art; it passes on a set of criteria by which the sciences can secure the correctness of their inquiry. But this security that logic as a propadeutic is supposed to offer, raises questions about the security required by logic itself. The rules for the metadirection of logic must themselves be derived correctly. But how is this to be accomplished? It would seem prima facie that one would need an infinite set of rule books for the derivation of rules. And of course this, as a reductio ad infinitum, reduces to the logically absurd. And yet for all these meddlesome considerations, logic gets underway and establishes itself through the truth of its practice. We could ask, in good Kantian fashion: granted that logic actually establishes itself, how is this achievement possible? Not only can we ask this question; we must ask it, if, that is, logic is properly characterized as a propadeutic to scientific endeavor. What causes the apparent problem of logical derivation? In coming to a reductio ad infinitum we might consider that our own rule-oriented approach has been misguided from the outset, as it were. It may even be that this misguidance is not to be understood only as an error, but also as a clue --a pitfall that may yet harbor the possbility of truth on the matter its seems to deviate from. But however the case, everything depends on this (and here we echo Hegel's words from part one of these posts): that we recognize the impossibility and even undesirability of establishing yet another meta-direction to avoid initial misdirection.

What Epistemology? What about Logic? A (Self-) Reflection on the Limits of the Self-Reflexivity of Knowledge (Part One)

Recently, a brief argument was made (though perhaps only indirectly as fodder for dialectic) in support of the legitimacy of epistemology insofar as it is understood as being "motivated by a practical concern for actually having knowledge." Such an epistemology, the claim continues, "is prerequisite to the sure success of metaphysics itself." The practice of critique (and the primacy of the practical domain that it implies), the concern for actual possession of knowledge, and, of course, the demand that metaphysics be successful, are all, even if they may also be other things, unmistakably Kantian (see here for a few volleys regarding just these points in their connection to the central contention of Kant's first Kritik). Anticipating his sweeping critique and simultaneous justification of skepticism in his Phenomenology, Hegel's response to this sort of deference to critique/epistemological propadeutic, found in his famous Introduction to that opus, is among the most succinct formulations of a powerful counter-thrust to this epistemological tendency:

Meanwhile, if the fear of falling into error introduces an element of distrust into science, which without any scruples of that sort goes to work and actually does know, it is not easy to understand why, conversely, a distrust should not be placed in this very distrust, and why we should not take care lest the fear of error is not just the initial error. As a matter of fact, this fear presupposes something, indeed a great deal, as truth, and supports its scruples and consequences on what should itself be examined beforehand to see whether it is truth. It starts with ideas of knowledge as an instrument, and as a medium; and presupposes a distinction of ourselves from this knowledge...

 The practically motivated epistemology that sets for itself the goal of establishing those things that would be a prerequisite to the "success" of the first science, namely metaphysics, is itself, in Hegel's estimation, indebted to a presupposed understanding of knowledge as "an instrument, and as a medium" --hence the need to learn how to direct it which this proposed epistemology would satisfy. But the instrumental function of knowledge is indebted to a much older thinking which, perhaps ironically, has no place for epistemology. This older thinking is the thinking of that ancient founder of Logic, Aristotle. That consideration capable of considering knowledge apart from its objects, and thereby capable of directing scientific pursuit as a propadeutic to the latter which could ensure its correctness, is to be found in those books which Aristotle called the Organon, the instrument. But what of this understanding of logic as a propadeutic, as an art, and as the directions for right reasoning? How does it fare against Hegel's critique? Does his critique not penetrate even beyond Kant and into his greatest intellectual fore-father(s)?