⁴ At first glance this principle does not look like a synthetic and transcendental proposition, but rather appears to be tautological and to belong to mere logic. For the latter teaches us how we can compare a given representation with others and form a concept by abstracting what it shares with others as a characteristic mark for general use. But logic tells us nothing about whether for each object nature must also show many others that can be compared with it in similarity of form; on the contrary, this condition for the possibility of applying logic to nature is a principle of representing nature, as system for our power of judgement, in which the manifold, divided into genera and species, makes it possible for us, through comparison, to bring all the forms of nature that we may encounter to concepts (of greater or lesser generality). Now the understanding certainly teaches us (though also through synthetic principles) how to think of all things in nature as contained in a transcendental system in accordance with a priori concepts (the categories); but the power of judgement, which (as reflective) also seeks out concepts for empirical representations as such, must assume therefore in addition that nature in its boundless multiplicity has hit upon a division into genera and species which makes it possible for our power of judgement to find concordance amongst the natural forms which it compares with one another, and to arrive at empirical concepts, and their interconnection, by ascending to more general, though still empirical, concepts; i.e. the power of judgement presupposes a system of nature in accordance with empirical laws as well, and does so a priori, and therefore by means of a transcendental principle.