So-called _laws of nature_ or _naturalistic laws_ are not laws, owing to the absence of the volitional element: they consist of simple enunciations of relations between empirical concepts, that is, of rules. This is an instance of what is called a natural law: platinum melts at a temperature of 1780 degrees; or this other of a grammatical law: that in the Greek language masculine nouns of the second declension have the genitive in _ου_(with exceptions, in this as in the other case). But they are laws in about the same way as the King of Cups is king; and indeed it is known historically that this denomination was transported by the Stoics from the domain of politics, where it had first appeared, to that of nature. Empirical concepts and rules may, as we know, assume an imperative literary form; hence it will be said: "If you wish to melt platinum, heat it to 1780 degrees"; "If you wish to speak Greek, decline masculine nouns of the second declension with an _ου_ in the genitive." But the literary form does not change anything of their true nature: those imperatives are hypothetical imperatives, that is, false imperatives, improper laws. Grammatical and chemical laws will remain mere formulæ, instruments of knowledge, and not at all of action, until some one obliges me or I oblige myself to talk Greek, or to open a chemical laboratory where platinum is melted. The jurist who elaborates cases and rules is not the legislator: the latter alone (with a sword in one hand) can endow the excogitations cf the other with the character of law. [Sidenote: _Implication of the second in the first._]