In short, it is "not necessarily so" that the Constitution is preserved in the Court's reading of it. A third difficulty in the way of the theory that Judicial Review is preservative of the Constitution is confronted when we turn to consider the statistical aspects of the matter. The suggestion that the Constitution of the United States contained in embryo from the beginning the entirety of our national Constitutional Law confronts the will to believe with an altogether impossible test. Compared with the Constitutional Document, with its 7,000 words more or less, the bulk of material requiring to be noticed in the preparation of an annotation of this kind is simply immense. First and last, the Court has probably decided well over 4,000 cases involving questions of constitutional interpretation. In many instances, to be sure, the constitutional issue was disposed of quite briefly. In some instances, on the other hand, the published report of the case runs to more than 200 pages.[9] In the total, it is probable that at least 50,000 pages of the United States Supreme Court Reports are devoted to Constitutional Law topics. Nor is this the whole story, or indeed the most important part of it. Even more striking is the fact that the vast proportion of cases forming the corpus of national Constitutional Law has stemmed, or has purported to stem, from four or five brief phrases of the Constitutional Document, the power "to regulate ... commerce among the States," impairment of "the obligation of contracts" (now practically dried up as a formal source of constitutional law), deprivation of "liberty or property without due process of law" (which phrase occurs both as a limitation on the National Government and, since 1868, on the States), and out of four or five doctrines which the Constitution is assumed to embody. The latter are, in truth, the essence of the matter, for it is through these doctrines, and under the cover which they afford, that outside interests, ideas, preconceptions, have found their way into Constitutional Law, have indeed become for better, for worse, its leavening element.