To this act we shall give the general appellation of synthesis, thereby to indicate, at the same time, that we cannot represent anything as conjoined in the object without having previously conjoined it ourselves. Of all mental notions, that of conjunction is the only one which cannot be given through objects, but can be originated only by the subject itself, because it is an act of its purely spontaneous activity. But the conception of conjunction includes, besides the conception of the manifold and of the synthesis of it, that of the unity of it also.
Conjunction is the representation of the synthetical unity of the manifold.
It is therefore evident that the category of unity presupposes conjunction. Whether the representations are in themselves identical, and consequently whether one can be thought analytically by means of and through the other, is a question which we need not at present consider.