As Cicero has it, nature is “non artificiosa solum, sed plane artifex.” But the cogency of this reasoning, for the details of which I must refer the reader to Mr. Kennedy’s pages, becomes more apparent when we reflect on that second form of purposiveness, viz. adaptation to definite ends, with which we meet in the phenomena of organic life. If we watch, _e.g._ the growth of a tree we perceive that its various parts are not isolated and unconnected, but that on the contrary they are only possible by reference to the idea of the whole. Each limb affects every other, and is reciprocally affected by it; in short “in such a product of nature every part not only exists _by means of_ the other parts, but is thought as existing _for the sake of_ the others and the whole” (p. 277). The operations of nature in organised bodies seem to be of an entirely different character from mere mechanical processes; we cannot construe them to ourselves except under the hypothesis that nature in them is working towards a designed end. The distinction between nature’s “Technic” or purposive operation, and nature’s Mechanism is fundamental for the explanation of natural law. The language of biology eloquently shows the impossibility of eliminating at least the _idea_ of purpose from our investigations into the phenomena of life, growth, and reproduction. And Kant dismisses with scant respect that cheap and easy philosophy which would fain deny the distinctiveness of nature’s purposive operation. A doctrine, like that of Epicurus, in which every natural phenomenon is regarded as the result of the blind drifting of atoms in accordance with purely mechanical laws, really explains nothing, and least of all explains that illusion in our teleological judgements which leads us to assume purpose where really there is none.