In the case of two dissimilar things we may admittedly form some concept of one of them by an analogy which it bears to the other, and Analogy, in a qualitative sense, is the identity of the relation subsisting between grounds and consequences causes and effects so far as such identity subsists despite the specific difference of the things, or of those properties, considered in themselves do so even on the point on which they are dissimilar; but from that in which they are dissimilar we cannot draw any inference from one to the other on the strength of the analogy that is, we cannot transfer the mark of the specific difference to the second.