… comparison is the determination of a representation by the medium of that which is present, in contradistinction to its determination simply by that which is present. For example, I put A into relation to B, when in contemplating A, I as it were see B through it. The representation determined by the medium of A, may be called its correspondent. Then the immediate function of reference to a correlate is to conjoin that which is presented with its correspondent, and the introduction of the former conception is justified by the fact that only by it is the latter made representable. Accordingly reference to a correspondent is the third conception with content.