Now an a priori concept (a non empirical concept) either already contains a pure intuition in itself, in which case it can be constructed; or else it contains nothing but the syn thesis of possible intuitions, which are not given a priori, in which case one can well judge synthetically and a priori by its means, but only discursively, in accordance with concepts, andd never intuitively through the construction of the concept Now of all intuition none is given a priori except the mere form of apa