In the methods, on the other hand, since resemblances in their massive and clearly evident form are posited to start with, the continuity of nature will not be this purely negative postulate (no blank spaces between distinct categories), but a positive requirement: all nature forms one great fabric in which beings resemble one another from one to the next, in which adjacent individuals are infinitely similar to each other; so that any dividing line that indicates, not the minute difference of the individual, but broader categories, is always unreal.