In "Mind and World", John McDowell appeals to Kant’s dictum that thoughts without content are empty and intuitions without concepts are blind as encapsulating the idea of conceptualism about the content of perceptual experience. I argue that the appeal is inadequate, and this for a variety of reasons, one of them being that if Kant endorsed conceptualism along the lines of McDowell, he would be committed to returning to positions which he explicitly criticized, i.e. those of rationalist metaphysics; alternatively, he would lapse into an idealism very much akin to Hegel’s. This is because McDowell’s conceptualism ultimately neglects the role of sensibility in mediating the relation between "mind" and "world", which is crucial to recognizing the limits on cognition which Kant’s doctrine of transcendental idealism imposes upon subjects.