One striking contrast that Kant draws between the kind of cognitive capacities that humans have and alternative kinds of intellect concerns modal concepts. Whilst ‘it is absolutely necessary for the human understanding to distinguish between the possibility and the actuality of things’ (5: 401), the very distinction between possibility and actuality would not arise for an intuitive understanding. The aim of this paper is to explore in more detail how the functioning of these cognitive capacities relates to modal concepts, and to provide a model of the intuitive understanding, in order to draw some general lessons for our ability to make modal judgements, and the function of such judgements.

At A71/B96–7 Kant explains that singular judgements are ‘special’ because they stand to the general ones as Einheit to Unendlichkeit. The reference to Einheit brings to mind the category of unity and hence raises a spectre of circularity in Kant’s explanation. I aim to remove this spectre by interpreting the Einheit-Unendlichkeit contrast in light of the logical distinctions among universal, particular and singular judgments shared by Kant and his logician predecessors. This interpretation has a further implication for resolving a controversy over the correlation between the logical moments of quantity (universal, particular, singular) and the categorial ones (unity, plurality, totality).

In his Metaphysische Anfangsgründe der Naturwissenschaft, Kant claims that chemistry is a science, but not a proper science (like physics), because it does not adequately allow for the application of mathematics to its objects. This paper argues that the application of mathematics to a proper science is best thought of as depending upon a coordination between mathematically constructible concepts and those of the science. In physics, the proper science that exhausts the a priori knowledge of objects of the outer sense, only motions and concepts reducible to motions can be legitimately coordinated with mathematical constructions. Since chemistry can neither achieve its own a priori principles of coordination nor be reduced to the coordinated doctrine of motion, it is a merely improper science.

Little extended attention has been given to Kant’s notion of self-conceit (Eigendünkel), though it appears throughout his theoretical and practical philosophy. Authors who discuss self-conceit often describe it as a kind of imperiousness or arrogance in which the conceited agent seeks to impose selfish principles upon others, or sees others as worthless. I argue that these features of self-conceit are symptoms of a deeper and more thoroughgoing failure. Self-conceit is best described as the tendency to insist upon one’s own theoretical or practical conclusions at any cost, while still wanting to appear – to oneself or to others – as though one is abiding by the constraints of theoretical or practical reason. Self-conceit is thus less centrally the tendency to impose one’s will or inclinations upon others, and more centrally the tendency to reconstruct evidence and rationalize so that one may be convinced of one’s own virtue. While the conceited agent may ultimately impose her judgement upon others, she does so in order to preserve her delusion of virtue.

Kant’s conception of conscience has been relatively neglected by Kant scholars and the secondary literature offers no explanation of whether (and if so, how) his treatments of conscience fit together. To achieve a fuller understanding of Kant’s general position on conscience, I question the widespread assumption that conscience is a feeling and account for the nature of conscience and its multiple functions. On my reading, conscience is ‘the internal judge’ whose verdict triggers certain emotional reactions. Through the moral self-evaluative activities of this inner judge, we come to know our character better. In the judgements of conscience, we take account of various psychological conditions while judging both whether these conditions stand in the way of our establishing moral maxims and whether we hold ourselves accountable for our actions. By arousing certain feelings, these judgements also move us to moral action.