theological derivation of them. We must not regard it as insignificant, if one interchanges this expression with that of a divine purpose in the ordering of nature, or gives out the latter as more suitable and proper for a pious soul, because it must come in the end to deriving these purposive forms in nature from a wise author of the world.

On the contrary, we must carefully and modestly limit ourselves to the expression, a purpose of nature, which asserts exactly as much as we know. Before we ask after the cause of nature itself, we find in nature, and in the course of its development, products of the same kind which are developed in it according to known empirical laws, in accordance with which natural science must judge of its objects, and, consequently, must seek in nature their causality according to the rule