Where are those diagrams? And what does he mean, when he tells us in this connection that he is not a vain promiser? Where are those particular cases, in which this method of investigation is applied to the noblest subjects? Where are the diagrams, in which the order of the investigation is represented, as it were, to the eye, which serve the same purpose, 'that globes and machines serve in the more abstruse and subtle demonstrations in mathematics?' We are all acquainted with one poem, at least, published about that time, in which some very abstruse and subtle investigations appear to be in progress, _not_ without the use of diagrams, and very lively ones too; but one in which the intention of the poet appears to be to the last degree 'enigmatical,' inasmuch as it has engaged the attention of the most philosophical minds ever since, and inasmuch as the most able critics have never been able to comprehend that intention fully in their criticism. And it is bound up with many others, in which the subjects are not less carefully chosen, and in which the method of inquiry is the same; in which that same method that is exhibited in the 'Novum Organum' in the abstract, or in its application to the investigation of the physical phenomena, is everywhere illustrated in the most chosen subjects--in subjects of the noblest kind. This volume, and another which has been mentioned here, contain the THIRD and FOURTH PARTS of the Great Instauration, whether this man who describes them here, and who forgot, it would seem, to fulfil his promise in reference to them, be aware of it or not. That is the part of the Great Instauration that we want now, and we are fairly entitled to it, because these are not 'the next ages,' or 'the times which were nearer,' and which this author seldom speaks of without betraying his clear foresight of the political and social convulsions that were then at hand. These are the times, which were farther off, to which he appeals from those nearer ages, and to which he expressly dedicates the opening of his designs. Now, what is it that we have to find? What is it that is missing out of this philosophy? Nothing less than the 'principal' part of it. All that is good for anything in it, according to the author's own estimate. The rest serves merely 'to pass the time,' or it is good as it serves to prepare the way for this. What is it that we have to look for? The 'Novum Organum,' that severe, rigorous method of scientific inquiry, applied to _the more chosen subjects_ in the reigns of Queen Elizabeth and James I. Tables of Review of Instances, and all that Logic which is brought out in the doctrine of the PREROGATIVE INSTANCES, whereby the mind of man is prepared for its encounter with fact in general, brought down to particulars, and applied to the noblest subjects, and to every sort of subject which the philosophic mind of that age _chose_ to apply it to. That is what we want to find.