 Third, we need to distinguish propositions of law containing the concept of causation, from propositions about the law of causation. Our concern is with the former kinds of propositions; the latter propositions are the hypotheses of theorists (such as the present writer) about the content of the propositions that obligate legal professionals within their roles as legal professionals, i.e., law. But it is the law itself that is the data from which a legal concept such as causation-in-the-law is to be extracted.