All philosophy in so far as it is based on grounds of experience can be called empirical, that which presents its doctrines solely from a priori principles pure philosophy. The latter, if it is merely formal, is called logic; but if it is limited to determinate objects of the understanding it is called metaphysics. In this way there arises the idea of a twofold metaphysics, a metaphysics of nature and a metaphysics of morals. Physics will thus have its empirical, but also a rational part; so too will ethics, though here the empirical part might in particular be called practical anthropology,
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