in nature are really partitioned and therefore in themselves have to constitute a quantum discretum, and if the graduated progress in their affinity were continuous, they would also have to contain a true infinity of intermediate members between any two given species, which is impossible; but also because we could make no determinate empirical use at all of this law, since through it there is indicated not the least mark of that affinity, or how and how far we are to seek the degrees of its variety; rather, we are given nothing more than a general indication that we are to seek for it.