From the concept of a cause as a pure category (if I leave out the time in which something follows something else in accordance with a rule), I will not find out anything more than that it is something that allows an inference to the existence of something else; and in that case not only would there be nothing through which cause and effect could be distin guished, but further, since the possibility of drawing this inference also requires conditions about which I would know nothing, the concept would not even have any determination through which to apply to any object!