This chapter defends the view that H.L.A. Hart's position, as stated in his own terms in The Concept of Law , though it is up to each person to adhere to it or not, can be intelligibly made sense of by its own merits. It argues that Hart is drawing attention to certain empirical features which must go into a non-reductive understanding of our concept of law in general. Russell attributes two qualitatively distinct forms of knowledge to the human mind, the main purpose of which is to stipulate that one of these forms of knowledge is of things “immediately known to people just as they are“. It is noteworthy that the ideas of Russell played an important part – albeit a negative one – in the formation of Hart's philosophical ideas. Hart's account of what he calls “descriptive sociology” is strikingly close to Austin's “linguistic phenomenology”.