Ver. 526. _But if in noble minds some dregs remain, &c._] So far as to what ought to be the true critic's principal study and employment. But if the sour critical humour abounds, and must therefore needs have vent, he directs to its proper object, and shows, from ver. 525 to 556, how it may be innocently and usefully pointed. This is very observable; our author had made spleen and disdain the characteristic of the false critic, and yet here supposes them inherent in the true. But it is done with judgment, and a knowledge of nature. For as bitterness and astringency in unripe fruits of the best kind are the foundation and capacity of that high spirit, race, and flavour which we find in them, when perfectly concocted by the warmth and influence of the sun, and which, without those qualities, would gain no more by that influence than only a mellow insipidity, so spleen and disdain in the true critic, when improved by long study and experience, ripen into an exactness of judgment and an elegance of taste, although, in the false critic, lying remote from the influence of good letters, they remain in all their first offensive harshness and acerbity. The poet therefore shows how, after the exaltation of these qualities into their state of perfection, the very dregs (which, though precipitated, may possibly, on some occasions, rise and ferment even in a noble mind) may be usefully employed, that is to say, in branding obscenity and impiety. Of these, he explains the rise and progress, in a beautiful picture of the different geniuses of the two reigns of Charles II. and William III. The former of which gave course to the most profligate luxury; the latter to a licentious impiety. These are the crimes our author assigns over to the caustic hand of the critic; but concludes however, from ver. 555 to 560, with this necessary admonition, to take care not to be misled into unjust censure, either on the one hand, by a pharisaical niceness, or on the other by a self-consciousness of guilt. And thus the second division of his Essay ends: the judicious conduct of which is worthy our observation. The subjects of it are the causes of wrong judgment. These he derives upwards from cause to cause, till he brings them to their source, an immoral partiality: for as he had, in the first part, traced the Muses upward to their spring, and shown them to be derived from heaven, and the offspring of virtue, so hath he here pursued this enemy of the muses, the bad critic, to his low original, in the arms of his nursing mother immorality. This order naturally introduces, and at the same time shows the necessity of, the subject of the third and last division, which is, on the morals of the critic.